Ways of Switching up Routines?

[BaKoBoY20]

I tried out the 5x5 program and it worked very well for me. All my lifts went up and I gained a solid 5lbs. in 6 weeks. However, after the sixth week the training caught up with me and I became sick because of my weak nervous system. I was wondering what you guys would advise for switching programs. I still would like to train 3 days a week, but should I increase the reps/ lower the sets? Should I switch up the exercises? Thanks for the help.

 

[Numani]

why change?
you said " it worked very well for me."

keep on it.

just have a backoff week. sounds like your feeling the effects of overreaching. slight nervous system fatigue. no need to radically change whats been working.