Hey Drago,

With that level of pain and stress on the muscles I'd have to guess your muscles are experiencing a catabolic reaction (they're feeding off themselves.)

Nutrition is obviously essential and automatically I'd start to intake more foods.

However I'd also review the exercises I was doing.
Supersets although economic and effective are notorious for inducing injuries when done over a period of time longer than 4 weeks.

Bodyweight exercises are excellent for conditioing the body before weight training.