I'm A 18 Year Old Female & I Haven't Gotten

I'm a 18 year old female & I haven't gotten my period in the last 2 months. I went to my doctor and he told me it's because of my depression and I'm overweight and stressed. Since then I changed my diet & started eating less and more healthy. Starting last week I started feeling a tingling when I urinate. Now I'm seeing clogs of blood when I wipe after I finish urinating. I'm very worried & scared. What do I do? & what is wrong with me?