Help... My Knuckles Hurt!

Lately I noticed that my knuckles are in pain especially during morning which make it quite difficult for me to carry my baby when feeding. I can feel some annoying pain on my joints (hands, knees). Symptoms of arthritis? Rheumatism? I thought I am only iron deficient... Whoa what a pain! There were so many complications that I felt along with my C- operation. Yeah, my doctor said that my healing progress was so poor that until now I still have to put some ointment on my belly (the c-section). I am also reluctant to drink milk because of constipation... I am now taking the prescribed medicine given by my doctor, that was good for seven days, it's my third day now and I can still feel that pain :,(