What happens going from SSI to reg SS

Good morning.

I am currently on SSI (low income disability) and turning 62. My understanding is I am required to start collecting regular SS benifits?

If so what happens to my insurance coverage? (I will be collecting over the $994)

Are there options for coverage?

I have extensive medical expenses and on several high cost prescriptions so being without out coverage until 65 (medicare) is terrifying.

I have called social security 3 times for clarity but each time I'm told something different. One person mentioned if I work part-time the income limits go up. But did not tell me what program this is or any additional information.

Thank you for any information.

I am located in Texas.