Your wife's health must take precedence over anything WT related.
They caused her stress, they caused the flare up of her symptoms. They SWINDLED money that you donated for your KH's upkeep, and then sold your KH right out from under you. They don't deserve your loyalty or hers.
Give them the big fat FARK YOU, then go live the rest of your lives in peace. Don't give them another second of your time.
When you move, find the local chapter of the MS society and attend the various events they offer. Go to the movies on cheap night. Take some cooking classes together. Just don't let the JWs in your area know who you are.