I would say that you should consider taking biology, chemistry, calculus, and physics courses in community college first. Then maybe you can take a few upper division bio classes that are required for a typical biology major at a 4-year university, and look for research opportunity at the same time.
You can try to look for lab assistant / research assistant position as a start. It should be relatively easy to find one if you are in Greater Boston area, or if you can commute to Boston/Cambridge. Otherwise, you still may have a chance to find the same kind of position at a nearby research university/ies.
I don't think that a science degree is absolutely a must if you can show that you have mastered the scientific knowledge that is expected to have from a bachelor degree holder. Typically, it can be proven by doing well in courses and, especially in situations like yours, an outstanding subject GRE test score.
