I Have Been On Docycline For 6 Weeks,, We Thought

I have been on docycline for 6 weeks,, we thought that there was some sort of infection based on my symptoms. No blood test or the swab test has shown any type of infection at all. Iam having like I would say a build up of some sort that comes out almost like dry mucus. when it comes it feels like it came out like it is blocking and then an abundance of ejaculation comes out after that.. ideas,, suggestions? Yes I do have a Urologist and nothing has been found. i almost feel like im going crazy on anolizing this,, it is not in the norm for me, I have explained it to my dr. and he is telling me that sperm can change. Also am having swelling of the right testicle,,, I have used ice,, it does take the swelling down but,, geez,, something is going on and have no clue where to go or what to do. Joseph