Please advise

Ok, I think I'm on a beginig of a Nervous brake-down because of this. It started maybe 6 -7 months ago, I got a cold and went to a doctor and she gave me some Antibiotics , after couple of days the cold was gone, I was feeling much better, but I got some red spots on my tongue ( I guess that is the rush), I went to the doctor again, and she was pleased that the Antibiotics were doing the job quite well and she gave me another dose. This time my tongue got white.
I thought that it was nothing, and will go away. Then I stared reading about it, and how oral thrush can be/or is a first sign for a HIV infection. This made me feel so bad, but then it has been maybe a year or 2 since my last sexual encounter. This made me to search for more things about candida, and from everything I red, the symptoms and reactions, it seems that I have had it for almost my whole life.
For instance before the oral thrush, I have had cramps in my stomach,gases, craving for food ( but never gain weight ), when hungry shaking for food like I’m using the last energy that is left in my body, Insomnia, when I go to sleep, can not fell a sleep for hours, Depression , tinny red spots on my tip of my tongue, loss of concentration, and loss of memory.
Ok, I have to add here, I smoke 10-15 cigarettes per day, drink 2-3 coffees daily, because of my work I go late to bed, these things must be some sort of a factor.
I have done a blood test, and my doctor said that the blood was ok. Then she gave me Nystatin tablets to take, but the tongue is still coated, after 2-3 months of treatment. Is this “normal”? In the prescription says that if the infection is bigger the treatment should be extended to 5-6 months. Positive is that, the cramps now are not that frequent, the tongue is coated but not heavy, I don’t shake anymore when hungry, and I still have the same appetite, even maybe bigger, as before. What should I do? Is there a diet with fast results? Is there anything that I could take, some herbs or something . This is making such a huge stress in my life, that i feel so miserable.Please help!

Any reply will be helpful
Thanks
Ana