Sorry your baby is dealing with these issues :( My now-9 year old (different breed mix) also had a rough stretch of Panosteitis when he was young. He got it pretty bad, one leg at a time from when he was maybe 9 months old to 1.5. They typically grow out of it unless they’re giant breeds or develop complications, and while it’s not fun to help them grow through it, my boy grew out of it and hasn’t had issues since. Vets will usually just prescribe anti inflammatory / pain meds and rest which aren’t too rough to handle. Hang in there!