Panic attack during GMAT

I began my GMAT prep on 1 Sep 2022 with the goal of completing the exam in November so that I can start sending out my applications by December.
I started by taking the first Practice test on mba. com, as recommended by most study plans I came across, and scored 590(Q39 V32). I realised that my foundational knowledge of the quant topics left much to be desired and that I needed to become familiar with CR and RC questions.


Study plan:

1) I signed up for a group coaching class called Verbal Hub in Delhi, India (where I reside). The verbal lessons weren't as in-depth, but the quant breakdowns of questions of different difficulties helped quite a bit.

2) I purchased a month-long subscription to Target Test Prep after enjoying the Free trial offered when you sign up to GMAT club. This significantly improved my quant knowledge.

3) Attempted practice questions from GMAT club, went through Powerscore CR Bible and Manhattan SC guide, and left the OG questions for last


On 2 Nov, I took Practice Test 2 and scored 690 (Q44 V40).

While I was thrilled to have achieved a 100-point improvement, I felt that my Quant score could be so much higher.
So, for the next few weeks, I went through the OG quant and verbal sections, attempting more quant questions than verbal.

On 25 Nov (4 days before my actual GMAT exam), I bought Practice Test 3 & 4, and took Practice Test 3.
Scored 710 (Q46 V42)

I was still disappointed that my Quant score hadn't improved significantly but was happy with the overall score since my target was 680.


Exam day:

Noteworthy, I have been diagnosed with panic disorder. So, I did everything in my power to remain calm throughout the whole process.
The night before the exam day, I tried a few practice questions and went through flash cards. I went to bed early, but I couldn't sleep. I probably got 3 hours of sleep before I had to get up and head out for the test center. I made sure to have a healthy breakfast and do breathing exercises so that I don't lose my calm during or before the exam. Got to the test center early and went through all the formalities smoothly before sitting for the actual exam. Everything seemed to be going fine until I got to the Quant section. (I chose the default order)

I am fairly certain that I was on an Easy question when I suddenly started having a panic attack (Hands and legs shaking, heart racing, vision blurring - the whole bit). I tried to take deep breaths and calm myself down. But by the time I had regained proper vision, there was 23 minutes left (I was on question 11).

I got through the section as efficiently as I possibly could, using POE for most of the questions that seemed lengthy to me, and took the 8 minute-break afterwards to prepare myself mentally for the verbal. But I think my self-confidence was already at an all-time low. So, I approached the verbal section with a lot of trepidation and suffered for it.


Ended up getting 590 (Q36 V35) as the unofficial score.
Back to square one.

I rejected the score, left the test center, and cried all the way home.


So...

Any advice on what I should do to prep for retake?

With respect to both actual preparation and mental state.

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