A healthy sleep is paramount. I suggest you try natural relaxing/sleep remedies like frankincense and lavander essential oils. Get away from your computer when it's bedtime. Cut down on stimulants like coffee and soda. Let go of social media negativity. Getting a pet helps with anxiety, taking a walk and exercice too. I can keep on going with advice to counter anxiety, but I think you should pause and think: if your current lifestyle isn't helping your mental state, maybe it's time to change your lifestyle.

This reminds me of a Seinfeld episode where George is pissed off at his life because nothing is working out for him. Then Jerry advises him: "If every instinct you have is wrong, then the opposite would have to be right." Then George starts doing the opposite and his life improves. It's a brilliant episode.

P.S. You don't need to go to the clinic, it's useless, they'll send you back home and tell you there's nothing wrong (no heart attack or shit like that). Remember, although panic attacks are extremely uncomfortable, they never killed anyone. Nobody dies from panicking. It only lasts 15min then you're fine, right?