Hi.. A Few Week Back I Starting Working Out And

Hi.. A few week back I starting working out and then my calf muscles started to ache I told my boy friend he told that it was completely normal later on 2 weeks down the line I still had the same pain and then I was down with viral fever for one week so I didn't do my routine exercise and now that I'm fit and fine my knee aches like crazy while climbing down or up the stairs I can't walk fast or run.. it aches a lot... what do I do ??