Can the therapy here solve my issues ?

Hello everyone I'm new here.

I have a huge issue that is starting to ruin my every day life, and I want to put end to this situation before it gets worse.

I have an issue that although sometimes you find me smiling and happy and social, suddenly in one hour I become depressed, sad and not able to focus or talk with someone normally or even look at them in the eyes. And this this goes for days until I somehow return normal. And this goes on and on every week which makes me tired and effects my life.

As I read this may be an anxiety attack. I'm trying to seek a local Therapist. But untill that is the online therapist here would be enough ? And do they describe medicines else ?