No advice, just sympathy. My boy injured himself in turnout at the end of August, and we're on our 3rd diagnosis so far. First was "bee sting". Second, after an ultrasound, was "mild suspensory damage". Now the vets say that it's not been acting very like a suspensory injury, so they think that what might have happened is that he kicked himself in the back of the foreleg trying to get at a bug and damaged the tendon sheath. Any way you slice it, I haven't been able to ride him at all since August 30. He's on limited turnout too, and he is BORED!! He tells EVERYONE how BORED he is ALL THE TIME.
He's on limited turnout - has a smallish runout attached to his stall. Big enough for him to wander a few steps, but not so big as to entice him to act like a wild man. Or so we thought... First, he started leading Dawn Patrol with the senior citizens in the adjacent turnouts, and talking them in to racing around and bucking (and he led by example) so now we have to close the stall guard at night to keep him in his stall. His little runout is pretty close to the ring where the lessons go down, and his latest trick is to hide in his stall and wait for some lesson horse to come trotting down to that end of the ring, and then my boy ERUPTS from his stall like he's being shot out of gun, and challenges the lesson horse to a race.
So now he gets the stall guard put up whenever someone is riding in the ring too.
And it's been raining, so when he CAN go outside, he hangs around drinking from mud puddles. He hasn't gotten himself a GI infection...yet.
I swear, this is all stealing ten years from my life. He's being so naughty, trying to get the other horses all stirred up because he's bored. I've put enrichment toys in his stall, his hay goes in a hay net with small holes (and that actually keeps him occupied for a good long time), and I go to see him 2x per day. I had been hand-walking him and grazing like you, but the other day he threw one of his eggbar orthopedic shoes, so I need to let him lay about in the stall until the farrier can come tomorrow.
The Pajama Parties with the senior citizens definitely set him back a bit. I thought the swelling would NEVER start to go down, but it's been improving rapidly in the last two or three weeks. Now I am hoping that we'll get cleared to lunge soon. Huey doesn't like lunging usually, because it's so boring, but I bet he'll be super excited when he sees the lunge line come out for the first time.
Hang in there. Your horse has to be a horse, even though that's going to make it longer to heal whatever it was that happened. The only real alternative for a horse like that is to get tranquilized all the time, I think, and who wants to do that?
Might be worth getting an ultrasound or an xray, especially since you're not sure what the damage is.