First things first - STOP googling. Promise yourself you will never google symptoms or illness again, okay? It does NOT help, it will only fuel your fears and make yourself feel worse. If you only make one choice today, please let it be: I will never google illness or symptoms again.
In fact, the golden rule of most people on here is: NEVER google the symptoms. The worst, most scariest thing is bound to be top of the list.
One of the things I tell myself when I feel like 'oh, there's no guarantee I won't be ill one day', is that if I ever do get ill, I will deal with it. I will have no choice but to deal with it. Yes it's awful and scary but we would all, eventually, deal with it.
So please don't tell yourself that talking to a therapist won't help. As I say, HA is a form of OCD, only it's your thoughts that are obsessive rather than your actions. Please, please talk to someone about it!