Start your own landscaping company for the time being. I'm sure you have a lawn mower.
All you need to do is pound the pavement, send out flyers in the mail and spend couple hundered on an ad in the newspaper for 3 or 4 weeks.
I know it sounds crazy but you can probably charge $30-50 a lawn, thats the going rate up my way where the lawns are fairly big. Even if you have to drive to a wealthier community.
When I was 16 in HS, just got my first car I had 7 customers and didn't even try hard to get them. They were all within 2 miles of my house. I charged $30 a lawn, under the going rate of $40-50 from the big companies. Thats $210 a week, in cash, under the table. each lawn took about 30 mins. So I was making about $60/hr.
The following summer I hired 2 friends and charged about $40 a lawn. With about 15 customers. I paid them $30 to mow and made $10. So now if I mow a lawn I get $40 + $10(friend)) + $10(friend). I just made $60 for myself in roughly 30-40 mins.
Then you can pick up bark multching jobs, raking, spring, fall cleanups...etc.
I know it sounds foolish to go back to mowing lawns. But if you are really struggling and want it bad enough (walk door to door) you will get plenty of customers. Even if you don't hire someone you can reasonably do 5 lawns a day without killing yourself. 5*40 = $200 a day...under the table.
It takes little skill to mow a lawn and you can still focus on RE on the side because you'd have plenty of time. Its not a glorious way to make money but it beats working at some retail store for $7.25/hr.
You can do it!
I also think picking up a technical skill at a college is a good idea, but that isn't immediate money and it sounds like you could really use some...NOW!