Welcome Lynda, congratulations on that weight loss you achieved, and sorry to hear about the stroke you had. If you are experiencing a plateu in your weight loss then it could comprise of numerous things:
. eating wrong food
i guess you have to see the types of food you are currently eating, if they are unhealthy foods then you might not gain weight from a better metabolism with the routine you performed to lose your previous weight, but can stop you from achieving further weight loss.
. not exercising enough
if you've stopped exercising then it will lead to stop in weight loss. I assume you haven't but perhaps its time to increase the intensity of the exercise and incorporate newer techniques to the routine. Ie walk for 5 minutes more each day etc. Or encorperate newer techniques like doing some aerobics and some resistance training every day, this will help work various muscle groups and with better muscles can restart the process of long term weight loss.
. exercising too much
people who exercise too much can actually lead to a slower rate of weight loss. While exercise is good, if you do too much it can cause straining on muscles, which mean more resting periods... it would be better to do consistency rather than overexertion.
Just keep in mind that it is best to feel good both physically and mentally, try and keep focus on the goals you want to achieve and don't feel too stressed or depressed. A good mind and body can lead to a healthier person and in turn if you feel confident about your objectives and try to reach it, you will be able to.
P.S a gym isn't really necessary to achieve weight loss, i for one hate going to gyms with their fees and indoor scenery, for me it's better to go for walks or a jog outdoors rather than run on one spot for 2 hours.