Hi and welcome but i do think this isn't related to MS, you'd probably get more responses from places like the weight related forums, women's health etc
Your of the age group where you start to notice more the affects of muscle disuse, working on your weight and fitness levels is suppose to help but to exercise the muscle groups for bike riding, you might consider starting off using a stationary exercise bike before you get back on your bike.
Oh, If you have put the weight on since you last rode a bike, there could actually be a learning or i should say re-learning curve of your bodies physical strength, coordination, balance, weight distribution etc. it was just a though to keep in mind, because it made me think of my son's difficulty wakeboarding after a huge growth spurt between seasons, took him awhile to work out how to use his new body even though he's been wakeboarding since he was little.
Hope that helps.......JJ
I am not sure what forum you are shooting for. This is MS. What you describe seems like it has other causes than MS. Swelling and redness are not MS.
My ability to exercise waxes and wanes with symptoms. For weight loss I find focusing on diet is most helpful. Elimininating sugar and processed/fast food, minimizing grains, eating lots of low glycemic vegetables and lean protein, keeping calories down is most effective for me.
Have you considered physio to address your physical limitations?