New to forum: Desperately need advice

Hi everyone, I have finally decided to face the fact that I need to do something to help myself. A brief history... I am fat. *shock* I always say that I'm trying to lose weight and I guess over the last few years I've managed to take a bit of weight off but not nearly enough. Last year I was diagnosed with an autoimmune condition Ankylosing Spondylits and it's gotten so bad that I think it's about time to face reality. I also have insomnia so everything I do, is difficult. So, after thinking about it, I seriously need to get some weight off. The only thing that is so freaking ironic is now that I am willing to do something serious about it, I'm fighting this degenerative disease. It's progressing so rapidly and I do realize that if I don't get some of this fat off of me, I'm not going to be able to carry it much longer. So, to be totally honest, I've taken a long hard look at myself and came to this conclusion: I'm fat. I'm tired. I'm sore and I'm 40. LOL The fact still remains that I have to lose some weight. I already do the no sugar, nothing white and my diet is pretty clean. I can't be too hard on myself because I have lost about 25 pounds just with diet alone. Now, the weight isn't budging and at 230 pounds, this is not okay. My question is this (sorry it took me so long to get to it) Will swimming for an hour 3 times a week help? I don't think I can still work and swim for more than that. I cannot walk any distance due to my condition and weights are absolutely a no go. All that's left is swimming. Please be brutally honest and tell me what you think I can do. Thanks so much, L.