I'm very sorry. I know how people fall through the cracks. I am assuming you are in the US.
Persevere in your fight for disability. It usually takes 2 years to get SSDI and can take even longer. It is not always fair. Get a disability lawyer, they can help you get SSDI and don't charge anything until you receive your back pay and then it is a very reasonable fee. I think they are capped at around $5,500 as the max they can charge. Disability will open the way for medicare since you will become eligible after 2 years from your disabilty determination date (not the date you are notified you qualify).
Does your state have any kind of advocacy department? In Oregon, there is something called Senior and Disability services who help you with applications and to find help for your problems.
Has your disability insurance company really told you that you have to keep working? Generally, if you become disabled (even if it is temporary like a broken leg) they just need something from the dr showing why you can't work. Once you are actually on your STD then there is usually some kind of allowance to not pay while disabled. After 6 months or so you would roll to long term. Which once accepted you don't have to pay anymore premiums. Actually, most of them, if you are on STD then you don't have to pay anymore.
Talk to the welfare department about medicaid. I was on it for a couple of years and because of my D I got accepted which is pretty tough to do. In Oregon, one of their questions was, will you die or have serious complication if left untreated.
If you need meter supplies look on Craigslist. I have seen a few people who have made themselves clearinghouses for leftover meters, strips and lancets. They can't handle drugs but often have strips they can give you.
Can your diagnosing dr. give you prescriptions? I have had drs. pity my situation and be willing to do this as long as they know you well enough to know that you need it.
Call churches or even homeless shelters in your area. They often know their way through the tangle of services and can help you find what you need.
If you can do something to get into a hospital system they have social workers that help you find services. When I was caring for an elderly relative they did wonderful things for me and hooked me up with all kinds of organization and information.
Also, if your other disability has some form of support organization you might want to join that. I know I was helping a friend out and was able to hook him up with some MDA benefits for his muscular distrophy.
Good luck and I hope you find some help.