Shortness of Breath

Anyone else experience shortness of breath on phenibut? I'm using the LiftMode HCL.

I'm still in the process of trying to figure out what the exact right dosage is for me and I feel like I'm very close.

I have taken as little as 1g up to 3.5g.

When I took 3.5 my heart started pounding an hour or so afterwards and I felt super uncomfortable/on edge. But after a couple hours of that misery I got very relaxed and laid my ass down and slept. Lesson learned that I personally can't take that much.

But back to the topic.. I've noticed I need to take a deep breath every couple minutes or so while I take this. I don't know.. it just feels like I'm not getting enough oxygen.. it's weird.

I'm thinking once I figure out my perfect dose for me this will stop. I have a couple more options in mind dosing wise.

The first time I ever took this, I took 500mg, then 500mg an hour or so later and I felt great. It wasn't as amazing as I thought it was going to be (hints why I've tried taking more) but I felt good with no shortness of breath, that I can remember.

So my plan is to try something similar to that dose next time.

But yeahhhh.... has anyone experienced the shortness of breath?