I sent him a email explaining my misunderstanding regarding this mediation process that he helped take advantage of me and my mom.Your attorney should have made it clear to you that you were negotiating for the amount that would cover the at-home care provided by your mom.
The problem you face is that you signed the release. Depending on all facts but based solely on what you have said, the medical release you signed during mediation is likely to be found legally binding.
Discuss this with your lawyer.
I'm waiting for a response on Monday even though he's checking his emails on the weekends as well because I've had contact on weekends with him via emails