You are simply not digesting your food. This can be a result of many things, the least of which could be directly caused by a pathogen.

There could be a metabolic disorder, and might require full hormone panel to correctly identify, toxic exposure, etc.

If there are infectious elements, they are likely caused by this main problem.

Hypothyroidism,diabetes,liver disorders, autoimmune,stomach disorders etc., should be investigated.

If you are exposed to many animals, there could be a helminth infection, but I doubt very much this is fungal-related unless you are immune deficient.

Shroom

I agree with shroom. You're having problems digesting your food. And if this has been going on for 5 months, you are at serious risk for many nutritional deficiencies, which will cause a million different symptoms for you.

Check out this page:
http://www.diagnose-me.com/symptoms-of/vitamin-B1-requirement.php

This is just one vitamin, but if you're low in it, you'll have everything from trouble breathing, trouble digesting, and trouble thinking. You'll even eventually have nerve pain in the feet.

Take a digestive enzyme with every meal. And then take apple cider vinegar about 30 minutes after you eat (no sooner). This should help you digest your food.

If you're not already, take a strong b-vitamin. All the water soluble vitamins are the first to be lost when you have a problem like yours. This includes minerals too, like zinc and magnesium, which we need every day. So take a multivitamin - a good one. Plus extra b vitamins, c and magnesium.

As for what caused this... hard to say. Could be something you've been eating. Lots of raw fish? Do you eat a lot of sugar, drink tea, alcohol or coffee? Do you have a thyroid issue? Diabetes? Have you had an illness? Have you been taking any unusual supplements or herbs? ALA? Medications? There are many many things which can deplete us of vitamins, even things which are supposed to be good for us.

Regardless of the cause, these suggestions will absolutely help you feel better. If you find that you don't improve, then at least trying these suggestions will give your doctor more information to go on. There is a bacteria and a parasite which can suck vitamins out of you. But it's not the first thing to suspect, unless you eat a lot of undercooked meat or raw fish.

Health and balance during a crisis is essential. The body can loose bile salts, which are essential.

I would supplement the liver, supplement the body, get a hair analysis, and check your pH on the tongue regularly. The first step in treating parasites is to get the body healthy, irrespective of any infection.

I find yogurt to be an absolute essential, along with citrus. Citrus pumps up the citric cycle and yogurt provides both bacteria and calcium.

Fundamentals.

Remember there are minerals, metals, antioxidants, and many other natural products that help re-establish balance. It is not as simple as taking a one a day.

In my experience the clicking sound are parasites (head).

I put fresh garlic cloves (peeled, cut long ways) in my ears, long enough, and snug enough to be easily pulled out I have great results with a high grade olive oil infused with tea tree, lavender, or frankincense too. Any essential oil will do.

Whenever I hear the clicking I put a drop of oil, and/or fresh garlic in my ears. The clicking stops pronto. When I first started this protocol, 10+ intact parasites dropped from my ears over 5 days, it was gross. I'll try and post photos. I douche my nose every morning with warm pink Himalayan salt too. I put Colloidal Silver in my nose, and eyes a few times a week. I've put wheatgrass in my eyes, and WOW, tons of parasites, they feel like sand in my eye, they burn, and after 'watering' the wheatgrass captured tiny parasites, sometimes it would stretch under my eye, only visible due to the wheatgrass stain.

Wheatgrass is actually good for your eyes, tons of vitamins, and oxygen, but don't do too many drops, the die off will block your ears for a day or two. Not for the feint of heart, it does burn.

I felt having protocols for my eye, nose, and ears were necessary in conjunction, oral, and the down under protocols as they move around.

I used to be a huge sushi eater, and let my dogs sleep in my bed. Despite having a super healthy diet, Genetically-Modified-Organisms /Gluten Free etc, my parasites were out of control. I can't believe the amount removed after 10 months from my tiny frame. And I didn't even feel ill. In hindsight the burden was so heavy, and I didn't realize it. Frog in heating water syndrome.

I wish you well.