Pain in left testicle. In details?

Hi doctor, I am 26 years old, male, I feel sometimes pain in left testicle, and that pain also going up to left leg but it's not always, and sometimes I get pain left side of my penis and left side of bladder when I do urine, but not always, I did USG of kidney and prostate usg also done, report normal, the left testicle is little down compare to right testicle, Before this problem I took propecia ( finasteride ) last year from may to June only for one month because of hair loss, I lost my libido since then and erectile dysfunction too, after 8-9 months also same problem I have, and getting this testicle pain, and my breasts are becoming little large, and left breast is bigger than right breast, is is because of low testosterone ? What to do now ? Which specialist I should consult ? Urologist or sexologist ? Can you describe my problem in details ? Thank you so much..