Transfer now. Get strong grades, LORs, strong MCAT, and obtain your clinical experience through volunteering, shadowing, etc. If you do that you will be competitive for medical school.
Option 2. Couple reasons. Med schools generally dislike it when people go to a program they aren't really interested in. If you are really interested in nuc med, that is better, however it brings up my second reason. I worked with a guy that finished nuc med school a year and a half ago and couldn't find a job anywhere. Not sure what it is like in your area but he was forced to do patient transport because there were no jobs. So having a nuc med career to fall back on may not be the best.
This is anecdotal though so take it with a grain of salt.
You need to get your girlfriend to support you. If you can't do that, there will be many more problems down the road. A lot of times there is a sacrifice and people need to decide which of the two things is more important and move on. If she can support you, you can make it.
Just in case you needed more encouragement...transfer now.
Don't fool yourself into thinking that this associates program is the only place to get good experience. You have 4 years of undergrad experience to put together some good EC's (4 years is a long time). If you take a full 4 years to get a BS degree, you will have plenty of time to look like a stellar candidate.