I can't find work!!

Hello there! I decided I would make a thread to see what other fellow nurses thought about my "situation." I became a nurse in 2010 (I was only 21 years old). I got my first nursing job at a hospital that I did my practicum at. It was an in-patient rehab (med/swing) type of setting. Very small in a very small town. I worked there for maybe six months then relocated 4 hours south. I then found a job at a bigger hospital on a Med-Surg floor. I worked there for two years. First mistake: I put in my two week notice but with two or three days left, I called the nursing supervisor and told them I would not be coming back. I am not eligible for rehire. I then found my *third* job at another hospital on a Med-Surg floor. I worked there only for six months. While there I met someone who was the DON at another type of facility where I ended up going to work at. During this time period I took up a PRN job at a n o t h e r hospital and ended up going through orientation but only worked 1 shift. It was sooooooooo horrible I never went back. (I do not include that on my employment history). I think this was my biggest mistake in my career - I left the hospital (I did complete my two week notice and am eligible for rehire) to go work at this other facility. I ended up grabbing a FT nights position after a month of training. Things started going down hill fast. The DON was forced to resign and I started getting called into the new DONs office a lot for petty things. Then someone started locking the girls bathroom on night shift so I did not have a bathroom to use for 8 hours. Aside from that - I had never been written up and was fired after working there for six months for false, petty things. Nothing involving "nursing." In fact, the DON that fired me said "It's a shame... you're a great nurse!" Since then it has been three months and I have not been able to find a job anywhere. I think I did myself in and ruined my career. I will graduate with a BSN in a few months and fear that it'll be for nothing. I don't know what I can do to show employers that I am serious about finding employment and I will not up and leave in a short period of time.