I'm going to make another suggestion, which isn't to far from seeking a therapist, however this method is free, confidential and most likely will open doors for you.
http://www.gaychurch.org/list-churches-by-state/?loc=TN lists churches in your area which are gay affirming/tolerant - meaning you are not going to go there and be bashed for being gay.
I would suggest one of these:
St. Anns Episcopal ChurchNashville, TNEpiscopal
St. Davids Episcopal ChurchNashville, TNEpiscopal
Why am I suggesting these?
Because many if not most of the ministers in the Episcopal church have a bit of real psychology training, and I know that the Anglican community support the secular mental health community via donations and charitable good works, thus either one of these churches will have a minster (priest) who will be able to talk to you more about this fear thing, in private and totally confidentially, to help you assess what kind of help you need.
On top of this, these churches will most likely have a long list of social programs in your community and can most likely hook you up with a therapist who is LGBT friendly, and works on at least sliding scale, if not offering free service.
I also notice in your profile (someone mentioned interesting pictures, so I just had to look) that you are with the suicide group here.
I think one of the important things if you are suicidal is to have trust-able people on your side. The Anglican Church isn't going to shove Jesus down your throat or insist you convert, sure they will make suggestions to do so... but its not mandatory. but it will provide you with safe people who are not going to have an agenda - well that isn't to say that is 100% certain, but most of the people in churches at least try to be good people, so you are safer there than at pool halls, bars and other scenes.
I also suspect you will find wise people who can befriend you and give you an ear and a shoulder. You may be surprised to discover that there are LGBT at these churches, which since you are a member of that club, it may make your life easier as a gay man in the straight world of Nashville.
As everyone else has pointed out, there is not enough data in your post to even get an idea of what you actually have, panic attacks, anxiety attacks, phobia? Each feel remarkable similar.
Depending on what this is and why you are going through it, the tools available to deal with it, cope with it vary greatly. Yes some include prescription medication, and if you go through a GP or psychiatrist they will medicate you and then leave you hanging.
This is why I think you should go to a safer source of consultation (a priest/minister) and as long as you are not saying things like "I'm going to kill myself today" s/he is legally obligated to keep confidences. So your 'secrets' will be safe.
Might be easier since this will be a person no one else in your life knows you know. Thus its not your doctor who you may feel may tell your folks or someone (illegal as all hell if he did since you are 18 and legally an adult, but that doesn't stop you from
feeling he might).