Good article!
Also, we recommend that OW students do not exceed 60', so that they can practice skills and spend time learning and getting comfortable with the water and with gear.
If it is the mask that bothers you, perhaps try getting comfortable with it at home, in the bathtub, walking around, looking at yourself in the mirror with your mask on. It sounds silly, but is a good low stress way to get comfortable with the mask. I know a lot of people feel boxed in by the mask face and skirt. Do you wear glasses? Liken it to wearing glasses, even sunglasses. If the skirt is black, perhaps a clear skirt will be better for you. Try wearing the mask to the pool, snorkelling around the pool with your mask. Duck underwater with your mask.
If you have a local lake, feel free to practice in 10/15' of water, sitting at the bottom with a buddy, flooding, partially flooding, and clearing your mask. Do this many times. I go down with my buddies still, JUST to practice one particular skill. I break it down until I know the skill automatically. Sitting in the water with your mask on in the 10', look up, look around. Get comfortable just looking.
I actually feel freer in the water, even with no visiblity, than I do on land. You can go anywhere! Realize you are in control and breathing. If you are anxious and have trouble breathing, slow down, and tell yourself to breathe more slowly and calmly.
Also, practice sitting at the bottom with your eyes closed with a buddy in 10/15' of water. Flood with your eyes closed and clear with your eyes closed. It sounds silly and time consuming, but it will be reassuring later. Also, practice taking your mask off, breathing, and putting it back on. Do this until you are comfortable. Make a game in a pool.
My mom had problems with this until they had a game to find dimes and put them in their masks. Try this in the pool and make the winner awarded a prize. My mom won with this incentive, afterwards unafraid of flooding her mask.
I intentionally flood my mask partially and swish the water around if it gets foggy, and clear. I hope this helps and remember that you are in control and by panicking you lose control.