Lymes disease: Rocket tested positive :(

So a few months ago rocket started showing signs of back pain. So I thought until the vet came out and said that he has arthritis in his hock and stifles. Because leg pain can shoe like back pain. Well since then he's been going down hill, he's been on cosequin and previcox with no improvements for a month. Along with it he started not wanted to be around people and unwilling to do any work. You could just tell he was in pain.
So we had him tested last Wednesday for lymes and it came back positive, now we have to test and see how bad it is and go from there as far as treatment. Im so upset this horse has been through enough he was a rescue and was 200lbs underweight when I got him and he has ulcers. Which have been treated.
Now im worried about what kind of quality of life is he going to have, will he always be in pain. Plus I read that it can cause laminitis if left untreated, what are early signs cause he's been very sore lately and I keep seeing red spots and bruising on his hooves cause they are white.
Sorry for the rant im just upset and wondering if anyone has had to deal with this??

Bump bump

So sorry to hear this. Tending to any sick animal is heart wrenching, let alone your horse. Glad you got him tested, and you were proactive based on the vets recommendations. All you can do is take it one day at a time. I don't have any answers to the possible effects etc, but I feel for you.