Hi,
That's a question no one here can answer. I don't think your condition would automatically exclude you from obtaining a higher medical, it would all depend on the details. If you are not having any complications, are not expected to have any, and are not at significant additional risk of sudden incapacitation (blackout, cardiac arrest, etc) I suspect you would be able to get a medical. Ultimately only the FAA can say for certain.
You can either start working directly with an AME who is authorized to grant first class medicals, or you might want to consult with an outside aviation medical service for guidance. There are several out there, here is one:
http://www.aviationmedicine.com/
Also note that for practical purposes, the second class medical is normally only used by people who are already employed as pilots who suffer a medical condition which precludes a first class medical. Almost all of the good jobs require a first class to get hired so you should attempt to qualify for that level if you are career-oriented.
Also note that a special-issuance or "waiver" first class medical may create difficulties when trying to get a job, especially at airlines. You really want a "clean" first class medical with no special requirements other than corrective lenses, if needed.
Good Luck.