You need to contact a local attorney IMMEDIATELY. Most will not charge for a short, initial consultation and they can tell you what the statute of limitations is in your jurisdiction. But the clock is ticking, so do it NOW. Once the statute of limitations runs, you are barred from bringing suit.
Only an attorney who has heard all the facts of your case can give you an exact answer, but I can tell you in general that time limits on these cases are strict. If you miss the deadline (called a statute of limitations), your case can be barred forever. For some personal injury claims, you have six years, for others you only have two. I'd be happy to recommend an attorney in your area. You can probably get a free consultation. I'd suggest doing this as soon as possible.