I need exercises to do! Please help

Go with the yoga. Stretching will really help with the ME and also help to warm your body up in the mornings so you'll suffer less pain during the day. There's a great series of yoga which was actually made for TV called Namaste Yoga by Kate Potter. They're 25 min sessions so not too demanding or time consuming. If you can get hold of them they'd be worth trying.

If I recall correctly the thing with ME is that if you don't exercise it can actually get worse BUT doing really energetic exercises can also make it worse so yoga is really helpful and then in the warmer weather add gentle walking for short amounts of time or gentle swimming. I'm not sure that I'd join a gym because the exercises there tend to be more focused on things like weights, running or walking on a treadmill or using other machines which won't really benefit you at this stage as they're too heavy for you.

For weight loss on its own it is about calorie consumption rather than exercise, but the exercise side of things should actually make it easier by smoothing out your metabolism and muscles etc. I also recommend consulting your GP as they should be able to help you with some low dose arthritis and pain medication which should help to relax your muscles a bit, and they will also be able to advise you on your current BMI and help to devise a weight loss program that is appropriate for you.

What about trying wii fit or one of the dance games? They are fun without a lot of strain and get you moving. I don't know if there is a mall around you, but I have started mall walking because I hate being out in the cold too long.