I was on bedrest for 4 months. I was terrible. I had to ask and accept help from everyone. Try to get your husband, friends, neighbors, and family to take turns coming over and spending time with you and your child. You need to be laying down and not moving as much as possible. You should only be getting up to go to the restroom and kitchen to eat.
Thus, running after your toddler, making dinner, house cleaning and shopping are not options. Explain this to others and make a schedule when people can come over to help you out. You can let dishes, laundry, and house cleaning go a bit and have only the bare minimum done. You can usually hire a cleaning service to come over for about $50 a week to do a basic clean. Try to have people bring over dinners or buy frozen dinners and casseroles that can be put in the oven.
If you cannot find people to help, your doctor can prescribe a hospice service to come to the house once a day or several times a week. Additionally, DayBreak is a service that provides temporary housing for children of parents who need a break for whatever reason, mental, physical, ailments, etc. When I was on bedrest in the hospital, I registered for this service. It's sort of like a temporary foster family that is available for you anytime.
You may also consider contacting your church or any church for help since you are on bedrest and cannot take care of yourself or your son right now. This is temporary, so do not feel bad about asking for help. This is for the health of your child and yourself.