Yesterday for the first time we brought our lab out to our camp thinking the exercise would do him some good. Our camp is about 5 miles as the crow flies. We stopped off a couple miles out of town to pick some greens and also to give "Jack" some rest and let him drink some water from the lake there. He was keeping up at 5-7 mph for a while then started slowing down, I didn't think much of it as long as we stayed in eye contact with him. During the last mile before getting to camp we couldn't see him anymore due to the terrain so we stopped and waited for a few minutes. When he didn't show up I went back to check on him and saw that he was trotting toward us, so we waited until he got closer and proceeded down the hill to our cabin. After arriving at our cabin Jack just stood on top of the hill watching us while we called out for him. Thinking he was just resting for a while we watched him for a couple minutes where then my son saw him keel over, saying Jack was kicking in the air. We grabbed some water then went up the hill where we found him lying on the ground.
After a while we brought him down to the sunny side of the cabin away from the wind to keep him from the cold north wind.
He slept for an hour or two with whines in between and seemed to be getting stronger because he kept lifting his head but only to cry out. After a few more hours he started to convulse and salivating and stayed like that for about two hours.
It was getting late so I brought the kids home and went back for my wife and Jack. By the time I got to them Jack had quit convulsing. When we got him home he finally had some sleep with urinating in between cries. All that time he couldn't get up but seemed like he was trying hard. At one point he stood up but keeled over.
All this time I thought it was EIC and he would get better but after reading about it online after we got home I think it is something else.
Roughly 14 hours after he collapsed at camp, we were woken to loud noises where Jack slept. We found him running around bumping into the walls and such where then he urinated on the floor and calmed down some. We put him in his kennel where he finally calmed down for a while but was unresponsive towards my wife and I at talking with him and trying to give him some water.
Half an hour later he starts to move around the kennel again and urinates. Pulled him out to clean him up and his kennel but now he's back to convulsing but this time he has his tongue out and breathing like after a short run whereas before he didn't.
Sadly there is no vet within 200 air miles of here or we would've brought him once he was down at camp.
What did I do to our Jack? Any home remedies I can give him? Help please.