I am so sorry you are going through this. I have had a panic disorder for most of my aldult life and it is truly horrid, you have my complete sympathy.
I totally agree you should go to see a doctor, there are plenty of things they can do do help you. My doctor put me on beta blockers when my panic attacks got really bad, you still have the same thoughts, the tablets are not mind altering, but they "blocked" the physical symptoms. the adrenaline was under control so mo more shaking, excessive sweating, dizziness or palpitations and then it was up to me to work on the mental side of things, though of course therapy can be a huge help for that.
Are you going through a particularly stressful time at the moment? Do you have any triggers that you know of? I would suggest keeping a diary of food and feelings and see if there is a common denominator around the times you have a panic attack. Sometimes just the action of writing it down can help on it's own.
Another thing that helps me MASSIVELY is listening to hypnosis tracks. I listen to one every night to help me drop off to sleep and there are tracks specifically dedicated to anxiety and panic attacks. You are taken down into a deep state of relaxation and then given gentle suggestions to your subconcious while in "trance". It can take a while for them to be affective but once your brain is used to them, and you fall into trance easily, the affects are honestly outstanding. I use Andrew Johnson's which you can get as an app on a smart phone, or simply go to his webpage on the net. there are of course plenty of other hypnotherapists out there with tracks you can download, but this guy works particularly well for me.
I wish you all the luck in the world, book the doctor's appointment now, and let us know how you get on.