Breathing difficulties

I was working... As usual, rushing urgent stuff.. Suddenly my vision blanked out and I felt headache.. Followed by tightening of chest and very deep breathing, seeming like breathing difficulty. The tight Chest and deep breathing went on for 3hrs and I couldn't focus and decided I should head to TTSH A&E for a thorough check-up and consultation.
This is the 1st time I'm having such heart and breathing issues and 1st time I checked myself into a hospital A&E..

I went there alone. I was not needing or hoping anyone to be there with me. I was left with some alone time with my mind and recalled how I expected or hoped that someone (perhaps my best friend) will be there by my side if times like such is to occur. Now that there are quite some changes in my life, I think I have grown to be even more independent, my mind has been maturing alot during these few months; I feel old! Like i aged 5 years within 5mths! Today, I am not sad/disappointed or hoping.. It's working out good. Blessings from my friends through FB and messages helped too I guess. Heehee.. Actually don't mean to check-in and make it drama, but for me it's a note to self that such thing happened and I should take are and be mindful to avoid reoccurrence..

Doctor says it is an anxiety attack.

Im also referred to 2 specialists.

I think this is the breaking point.. I really need to learn to relax, not push myself so hard, and get going on my short weekend trip after my exam on 6 sep before my next module starts a few days after.