T.F.
This is not the greatest time to sell a home and if you buy a home the interest rates are higher.
If you are having some problems financially, the LAST thing I would do would be sell and go for something bigger. It sounds like your husband needs to re-negotiate his deal with the shop. It could work out to his advantage because if he leaves the shop, the owner is not guaranteed to find a new tenant with this particular market, therefore, the owner might give him a break to stay.
As for at home business, you opened a can of worms there. You will have mlm'rs sending you all kinds of stuff. Just remember IF you go with a MLM at home deal, you are making money for whomever sighed you up not YOU.
Get on Ebay or Craigslist and sell some of your baby clothes, etc anything to make a little extra cash. Watch one or 2 children at home could also benefit your child. Built in playmates and socializing skills.
Good Luck