Glad your at least relatively OK, the guy stopped and you have his info.
I don't believe a lawyer is always the best bet, I didn't use one and all came out ok with the help of a lawyer friend who gave me subtle advice along the way. After my accident is when true patients comes in, although my insurance co and his were the same (AllSt...) and they worked well with me it's a long process. DO NOT GIVE THEM A STATEMENT ABOUT YOUR HEALTH. Tell them you don't know for sure "how you feel" or how bad your hurt. Don't lie, but if asked tell them right now you don't know, because trust me you don't. It may be a week or more before the full effects are felt, and even longer if you need physical therapy. BTW I assume you used your health care insurance for the ambulance and hospital, they will subrogate to get that back from any settlement you get....
Go to a trusted LBS with your bike, have them write up a detailed "repair" estimate. Don't let the insurance co us anything else for loss of you bike. This is separate from the health portion of the claim.