Dear OP, I'm a mum who had a 10-year fertility battle (and numerous miscarriages) before having my one and only DC.
Having been through all this, I too was diagnosed with a prolapse (vaginal). Frankly, I was pissed off: to have been through all that and then to have my (barely functioning) reproductive system head south was pretty much the final straw! And yes, it did put me off sex: felt as though I was sitting on a ball most of the time. They are very uncomfortable.
The bad news is that they won't get better on their own. If you read what happens as they progress toward the final stage, it looks extremely unpleasant.
My gyn. consultant recommended pelvic floor exercises, which I lazily ignored until things became less comfortable and I realised I had to deal with it. I've invested in a Kegel 8 ultra 20 pelvic floor exerciser: the model recommended as being best for prolapse, but any model will do the job. At over £100 they're not cheap, but in an early (1-2) stage prolapse they can either greatly postpone or in some cases I understand can even reverse progression.
Yes, you do have to keep it up and maintain, but as the machine does all the work for you this really isn't difficult. I do mine while I'm working at my desk! You can even do these in public provided you've got a pocket to put the unit it, and no one would notice. And they work across all pelvic areas: coming with vaginal and anal probes.
I hope you sort it as this can make you feel pretty rotten and isn't exactly conducive to feeling sexy. I know exactly how this feels, particularly after sex has felt so clinical for so long while you're trying to conceive (and the pressure is also not good for feeling in the mood). But these machines work (I'm not a representative of the firm BTW!) - I now don't feel as though I'm sitting on a ball anymore.
Finally - sending you my commiserations and empathy. Having a young BF child (I know all about this, too!) is tiring and hard work, without dealing with all of the above! Sending you
and a hug if you'd like one.