PLEASE HELP! How do you ease joints locking up in diabetics? My boyfriend's dad has been having REALLY bad trouble with his feet. Because he is diabetic, his feet curl up and stiffen causing excruciating pain. It happens almost every night and the only thing that helps is that my bf rubs out the cramps, but they come back about 4 or 5 times a night. 

The ONLY information I have is that his pancreas isn't shut down compleatly like most diabetics. It sporadically produces insulin and therefore messes up his blood sugar. It is VERY difficult to control it's levels.

Their family has a low budget, but I would like ANY possible information you can conjure up. NO matter how miniscule or bizarre. Please help. Thank you.

Summarized question: Could you please provide any information on easing joints lock up in diabetics?