Can someone help me interpret my holter monitor results?

[24Erika27]

I am an 18 year old who used to do gymnastics not so long ago(had to quit due to an elbow injury). Lately I've been feeling dizzy and I feel like my ears get clogged and everything sounds like if I was under the water, I get tunnel vision, and my chest feels super heavy (not painful but heavy in a way where I feel like I am not capable of getting enough air, especially while inhaling), this is usually worse if I lay down flat on my back. The other day I fainted in college due to feeling this way and my blood pressure was very low so my mom took me to a cardiologist, he ran an electro and an echo and both were normal but due to my dizzy spells he decided to give me a 24-hr holter monitor and these were the results. (He also made me get a DNA test for my thyroid and everything came out normal).
Results:

Rate Statistics:
Min rate: 55 at 00:01
Max rate: 160 at 08:40

Longest Tachycardia:0:12:25, 155BPM Avg at 08:36:00
Fastest Tachycardia:0:12:25, 155BPM Avg at 08:36:00

Supraventricular Ectopy:
Singles:39
Couplets:79
Runs:35
Fastest Run: 304 BPM at 1:36:17
Longest Run: 58 at 8:42:25
Total: 423

Ventricular Ectopy:
Sinlges: 151
Couplets: 14
Runs:4
Fastest Run: 200 BPM at 09:03:40
Longest Run: 3 at 09:03:40
Total: 191

RR Variability:
%RR>50: 23%
rms-SD: 60 ms
Magid SD: 85 ms
Kleiger SD: 189 ms

ST Deviation:                                II/Time:                     V/Time:
Max Depression:                           -25/06:10:00             -12/15:10:00
Max Elevation                                62/11:00:00              25/10:40:00

Pauses:
Longest RR: 1.59 sec at 04:31:34