So when I introduced my cb6000 to my girlfriend she loved it and immediately I left the key with her. After about 3 hours I peeked inside the opaque cage after the little guy was feeling funny and noticed I had this strange puffyness or swelling around the tip of my urethra. Immediately i was turned off and worried, so much so I shrank to a point where I could get the cage off(it was sized a little too big, again, I was still learning) So that was a relief but the puffyness/swelling lasted for another 2 hours before it was gone. Fast forward a week, I tried it again and after an hour the swelling returned!
This turned me off of chastity for a while and I was VERY upset because I absolutely love the idea and having a girlfriend that also does too all the while I can't use it is very upsetting

So I leave it be for a couple months, swelling doesn't come from anything else so it's not visible. After that long time, I decided to give it another go, change some sizing ect and change lubes. After an hour, again the horror returned and I was pissed off. This time though, I decided to go to the doctor, too nervous to tell him what I was doing that caused it but explained everything. I did yeast infection treatments and used multiple anti inflammatory's. I've been to a urologist, dermatologist and my own dr several times.
After using this anti-fungal for awhile, it actually irritated the NON EXISTENT swelling and brought it back WITHOUT the cage. And after that it has never fully gone away

If ANYONE has ANY kind of information/experience with this, Please, I beg of you, give me some pointers in the right dirrection.
I've determined it's not any lube i'm allergic too, I've determined it's not the opaque cage on the cb6000, I swapped it with a cb6000s clear. Tried different sized rings/spacers. I've tried a knock off metal one and same thing after 30 mins. Yesterday I tried again after not wearing a chastity for months, and I actually went 4 hours with no severe swelling but maybe I'm just paranoid but it looked like it swelled up a bit. No pain and barely visible but I THINK it's still going on. I just don't want to risk any more permanent damage as i think I've already done damage

Searched the forums a bit and found nothing on this, I've posted on other forums and tried many other different information sources, nothing so far.
21 y/o, relatively sensitive skin, only allergic to nickle(or cheap alloys).
For some examples of what it looks like.(NSFW, you know what you're about to see...)
http://sta.sh/0y1u75prg2l
And i'm not the only one. Looking at chastity 'stuff' I've seen others with it but there's no documentation anywhere! I've actually had someone message me about a post on a med site asking if I had a solution and said "No, do you!!?" and it ended at that

http://sta.sh/02aa5j7cgag3
THANK YOU!
P.S. Sorry for the long post, I just wanted to try and give all the information I've gotten so far, if I didn't there would be a lot of questions I've already gone over a ton of times.