Knee pain, @32. Suggest what shall i do?

My age is 32 years. I have a 2 year old baby boy. When my first baby boy was around 6 months, I had conceived for the 2nd time. But unfortunately my second baby got forcefully aborted due failed heartbeat when I was around 8 months pregnant. Again after few months I had conceived. But due to weakness, I used abortion tablets in my 1st month itself as per my doctor's advice. From that time onwards I am facing this problem of my knee pain. I thought it may be due to weakness. Some calcium+vit d tablets I used. But no use. Recently last week I had problem of frequent urination. Doctor adviced some antibiotics , but only little result. My teeth gums are also bleeding. Is this all due to weakness?? Or any hormonal imbalance? Pls suggest what shall I do?