Thoughts . . .
1. An oral contract in your situation is certainly enforceable and fairly common.
2. Unless the other party has some very persuasive witnesses prepared to lie on his behalf, I doubt you will have difficulty establishing for a fact finder (probably a judge) that this was a loan (why would you make a gift?) and there was some mutual expectation regarding repayment, and there has been a breach of the borrower's promise. Beyond that, you've got hurdles.
3. Small claims jurisdiction would be helpful, but $7500 probably exceeds the limit. Is the entire loan balance accelerated because of a delinquency in repayment? Some specific or reasonable interest? Etc . . . Collections on a judgment are never routine or efficient or even likely. If it can be had, some resolution (a compromise that leaves you with less than you should really get but guarantees you something) short of a protracted adversarial confrontation is . . . usually wise.
4. If it's obvious you need to take the next step and not just threaten to take the next step, then you should definitely employ the services of an attorney that can assess your prospects for getting paid and then act accordingly on your behalf. Never easy to just "find" a helpful advocate in your situation, either, IMO.
GL