I second Gene. Stay at the job and keep the insurance. It will cost a fortune without it. To buy private insurance is $400-$500 per month. Medicaid is not really an option, as diabetes is not regularly classified as a disability. Do some searches on this sight for additional information.
I truly feel that the most important thing about the job is benefits, not pay. Look at the "hidden paycheck." What do they pay for? It increases pay substantially, if benefits are good.