Is this all caused from candida

I have been suffering for over 1 year now and have had numerous tests by doctors who cannot really find anything except low b12. I am trying to see if anyone believes I probably have candida. Here are some of my symptoms

Severe fatigue
Insomnia
Hair loss
Digestive issues
Headaches
Swollen glands
Sometimes rashes popping up
Cold feet
Flu feeling
Athletes foot
Fungal nail infection on both feet
Sometimes joint pain and muscle aches
Floaters in eyes

I became ill after two courses of metronidazole for a tooth abscess and facing I lot of stress from a bereavement. If I try doing any activity my symptoms flare up. I took some grapefruit seed extract in water and put some on nails and also started 2 tablets of bio kult probiotics and the next day woke up and felt really bad fatigue and more digestive issues, it seemed everything flared up from taking these. When this happened I also had more frequent urination.

Does anyone think this could all be a candida problem that is causing my issues especially since I have had every test under the sun. I had a stool test done too which showed some yeast on culture and microscopic but not sure if this is a concern as we all have it present.

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