First tims i.v. of crystal meth, did I mistake the infamous "flash" as an overdose?

So my experienced friend/connect only i.v.'s. his gear, so I let him shoot me up, as soon as he shot me, I got super hot and everything was bright and I beecame a tad disoriented. I immediately ran to the shower, stuck my head in and soaked my head and went back to my bdrm and sat.in front of the fan for 3 mins and started to slowly feel better. I told him I think I did too much, and he said just breathe, that was the rush or "flash" you just experienced. Now is that true? I felt top heavy and vertigo, i just stayed cool, and relaxed and it passed in ten minutes. It was a tad over .1 but I have been smoking meth periodically for over 30 hours now so was it a "intense rush " or a slight O.D.?

 

Could have been close to too much I guess,,but sounds more like what I was looking for back when I was shootin' dope.
The difference between a helluva rush and an OD isn't that much tho.