i was rear ended but chose not to go to the hospital because ifelt ok after the accident but am now having back and neck discomfort is it to late

Though the injuries you describe do occasionally occur after a low-impact collision, they are very difficult to prove.  Juries are very skeptical of the "whiplash"  victim, and when the vehicles show little or no damage, and medical care was not needed directly after the accident then it is all but impossible to succeed in a claim.  Another attorney may have a different opinion and I encourage you to speak to other lawyers.  Please keep in mind that you have a three year statute of limitations to file a lawsuit, after that time you no longer have the right to do so.