I was sick 3 months ago and I still feel weak and I ache?

The question I have is I was really sick about 3months ago. I didn't go to the doctor and I recovered. The problem is I still feel weak and tired after being sick. I was wondering if it was a virus that needs antibiotics? I am going to the doctor in few days but was wondering what it could be? Like maybe chronic bronchitis? or Valley fever?