OP I am sorry you have found yourself in this situation. As someone going through this process now, but from a much more favorable starting position, I think you need to be more careful. Pulling the ripcord without backup plans was perhaps a hasty decision. I would try to make amends with your IM program and stay in the pipe or find another IM PGY2 spot. From the PDs I have spoken to gap years outside of medicine are usually frowned upon once you begin residency. Medicine is a very conservative field in that applicants who are outside the standard process are often ignored. Why take a risk on someone outside the pipe when there is a sea of qualified candidates that raise no questions? As mentioned above, you have a lot of things stacked against you, and IM residency gets much better after intern year. Finishing an IM residency will make you a more desirable candidate while also leaving you with the ability to still practice medicine and generate a good income if radiology doesn't work out. Regarding funding, while some programs wont look at candidates who don't bring their funding with them, most programs have plenty of money and don't care as much about the GME funding.
The fact that you got no interviews this cycle is a big red flag. Also if you applied to rads this year without first informing your IM program that's a match violation. I don't know how it played out, but that could have contributed to their decision to not renew your contract. There are a lot of unknowns here. To add, the fact that you had time to apply via ERAS this cycle tells me you had, at most, 4 months of IM wards/clinic before making this decision. Had you considered radiology as a medical student or done any radiology rotations as an intern? These are the questions PDs will be asking themselves. Speaking of PDs, you should be reaching out to the radiology program at your institution if there is one- that will be your best bet for getting a spot and their perspective will be the most valuable to you. However, that too is complicated by your lack of current relationship with your medicine program. No radiology PD will consider you without a positive recommendation from your current program.
Finally, your language makes it sound like you might be struggling with some depression and that might be affecting your decision making. I would advise you to seek some help, both with these decisions and perhaps with a professional for yourself if you can find the time/money. Many medical schools have GME career counseling services as well as mental health services. That might be a good place to start.