If you do a search on the internet, you'll find some helpful information.  I had this happen last year after we had rains on our drought stricken grass here in the Panhandle.  I didn't know at the time that the grass had something like 10x the normal sugars in it than spring grass.  Anyway, my vet put him on bute and had me ice his feet several times a day for long periods of time.  My farrier came in and put styrofoam supports under his feet to help support the coffin bone while the lamina died off and were replaced.  After about 10 days, I took him off the bute and put him on BL Solution (great stuff! and won't tear their stomachs up like bute), which kept him comfortable.  I also included Co-Q 10 (free radical scavenger to help support new lamina growth), Flax seed, and MSM in his diet.  I am happy to report that he has made a full recovery and we did not have any rotation of his coffin bone.  However, I will never let him out on green grass again.  He can have it after it browns up in the summer, but I am sure he will always have to be watched for insulin resistance. 

Good luck with your boy.  I've been through many horse emergencies and serious conditions, laminitis was in my opinion the worst thing I have ever dealt with.  I had never felt so helpless in my life and I hope I never have to go through that again. 

Running cold water on their legs works well, but you really must talk with your vet.

post your problem over here...http://www.horseshoes.com/forums/

Just went through this with my good friend...her horse foundered first week in January and called the vet right away.  She ended up at the University (my friend didn't want to take any chances...and the vet said she'd call it in for us)...but the vets at the University immediately pulled her shoes, taped styrofoam pads and supported the sole and frog right away (and gave her some bute).  The main thing was to let her stand in deep, deep shavings and not move her around too much.  She was on stall rest only (no turnout at all) for a week or two, and then only five minutes of walking twice a day in soft sand, but otherwise standing in deep shavings.  Good news is that the rotation of the coffin bone returned to normal in one foot, and only 1 degree in the other (from a 6 degree and 9.)  The hooves were trimmed, and repacked by a therapeutic farrier every 4 or 5 weeks.  The most important message by everyone was "BE PATIENT!"  If you managed to control the laminitis, it takes awhile for the damaged laminae to grow out, so turning out/riding too soon may cause a relapse.  Good luck!  There's still a lot to learn about this condition.

P.S. My friend also purchased a pair of those "soaker boots" that you can fill with water or ice if you have another episode. 

I've had good experience with Lamina Saver. Check it out on the net and it can be purchased from Valley Vet.com Foundering/Laminitis eposides take time to heal. I know it is hard to be patient, but you are on the right track now with farrier care. Discuss with your vet a feeding program for your horse to minimize a relapse.

PS I'm assuming your vet does not think this episode was caused by Cushing's Diesease. Cushhings horses develop bouts of laminitis in the Spring and Fall and was curious based on his age. Best of luck to you and your horse. Let us know how he is doing in a few weeks.