There have already been many excellent comments and suggestions in this thread, allow me to offer on other bit that might reassure you. It appears to me that basic physiology was working against you, and that can be dealt with, but you need to recognize what is happening.
Your narrative sounds very much like the normal anxiety of a new diver, but exacerbated by hypercapnia which is a build up of CO2. This is very common and was probably covered to some degree in your open water course. A regulator increases the work of breathing. Thick weight suit increases work of breathing, hood around neck may increases work of breathing, definitely increases your claustrophic feeling. Had to work hard to get through surf, increases CO2, likely not fully recovered. All on top of the general anxiety and tendency to short breath of all new divers.
You did not specifically mention breathing hard or feel air-starved, but I suspect that was a large factor in your feeling panicky.
Don't despair, hypercapnia and the resultant changes in blood pH are easily remedied by stopping and holding to something. Focusing on breathing fully and slowly will restore your blood chemistry to normal in 15-30 seconds. It is truly astounding how your body will recover as many can attest.
This is physiology that every diver is subject to, no matter how experienced, but experienced divers instinctively breathe more efficiently and slowly. YOU WILL TOO. Stay with it, and as others have suggested dive within your comfort zone and you will become more confident and less prone to have problems with anxiety and/or hypercapnia.
Your narrative sounds very much like the normal anxiety of a new diver, but exacerbated by hypercapnia which is a build up of CO2. This is very common and was probably covered to some degree in your open water course. A regulator increases the work of breathing. Thick weight suit increases work of breathing, hood around neck may increases work of breathing, definitely increases your claustrophic feeling. Had to work hard to get through surf, increases CO2, likely not fully recovered. All on top of the general anxiety and tendency to short breath of all new divers.
You did not specifically mention breathing hard or feel air-starved, but I suspect that was a large factor in your feeling panicky.
Don't despair, hypercapnia and the resultant changes in blood pH are easily remedied by stopping and holding to something. Focusing on breathing fully and slowly will restore your blood chemistry to normal in 15-30 seconds. It is truly astounding how your body will recover as many can attest.
This is physiology that every diver is subject to, no matter how experienced, but experienced divers instinctively breathe more efficiently and slowly. YOU WILL TOO. Stay with it, and as others have suggested dive within your comfort zone and you will become more confident and less prone to have problems with anxiety and/or hypercapnia.