Medical science limitatio. Is no answer?

I am 27 year old male suffering from leg pain and difficulty in walking and standing for long time It started with low fever and cough from last year and i have went through so many doctors - gp, psychiatrist, rheumatologist, neurologist, pulmonologist but no one have any answer for my problem I have went through brain and spine mri full body ct scan, ra, crp, esr, cpk, tsh, vitamin d and b12, ana, emg, nerve test. Leaving slight ana positive and vitamin d and b12 deficiency i have every other test fine. I didn't get and solid diagnosis One rheumatologist says it is fibromylagia and other said it is related something mind means may be psychiatric problem. I don't know in one how can i get psychiatric prblem. I still doubt whether it is lyme disease because i had rash in chest that time but i thought it is as ringworm because it has lil itching. Mystery is that whether i have fibromylagia, cfs, lyme or any other autoimmune but where i will get diagnosis in India or there is no answer