my mum has the same problems, she takes steroids, along with various other high strength pain relievers, and is almost always on anti-biotics because she has COPD, she also has a crumbling spine which means her spine is rubbing against itself and wearing away-in turn trappin nerves, and takes 28tablets everyday, and has done for as long as i remember. she decided to do something about her weight recently, and has lost almost 2stone, the first few weeks were slow, but she swapped a few things around (shes on SW) and cut down on carbs (she still has them, but on SW you have green days and red days, she prefers green, but only has 2 of those a week now) and the weight just started to drop off-keep at it hun, im sure you will see results soon. maybe it would be a good idea to speak to your GP about diet, they may be able to help you
xx