You absolutely can do this. You have been so far.
Couple of practical things. First the sewer line. Call your township and let them know you have a backup. It may be their fault. They should send someone out to try to clear it at the street. If this doesn't work you can go to a rental place or plumbing supply place and rent an auger. Ask for directions on use or you tube it. There is probably a video. This won't cost too much.
A couple of really good websites to help you out when in a tough time are The Prudent Homemaker and The Hillbilly Housewife.
Low cost and free entertainment for all of you can always be found at your local library. Plus continuing education opportunities, socializing, etc.
Also see if you have a CSA nearby. This is a Community Supported Agriculture. This can be a great way to get low cost locally grown produce.
Yard sales are your friend. People will be cleaning out closets soon for back to school. Also see if your community has a Facebook group for swapping clothes and such. Staples usually has best prices on school supplies. Sign up for their free frequent shopper card and get extra coupons, discounts and rebates.
It's early. Give me time and I will think of more.
You are going to be just fine.