This is my first post, though I've done a lot of reading on this site. I've done 3 extractions up to now using acacia C. each one better then the last. The last one I had white crystals that I scraped up into a white powder. I was using a glass pipe, then a glass bong, l had mix results hot tubing,( heating up a glass tube near the end and sniffing the powder through it)but still couldn't break through. So I did something kind of reckless. I put approximatly 60 mg in s shallow glass. I put 40cc of water and then with a strong I dropped in HCL tell the free base dissolved. Evaporated off the water. I then added more water and took it up into a clean during. I figured this should cause a break through. My girlfriend! There with me I proceeded to inject it.
I only had enough time to lay down on the bed. I could hear my GF asking if I was alright. I wasn't there no more an Egyptian looking entity was telling me not to answer her. I started thinking I was close to death, but it wasn't a panicked feeling. I then later in a void of geometric designs with no thought or conception of anything. Slowly I started getting a foot into this reality again. That was last night. Was that a breakthrough or a overdose.

Sounds like it could have been a breakthrough although recall of it seems vague? I believe I had some doses which were enough to breakthrough early on in my relationship with dmt but it took a while before I was actually able to take the experience back with me, it seems that there's a process of preparing you as to not overwhelm you all at once.

Look into finding a method where you can safely and accurately dose and just start small and work your way up trying to take back something and apply it each time you do it, experiment with what you're able to do to benefit / shape the experience with things such as meditation or music. That's my advice at least.

In my experience with breakthroughs there's usually a sensation of having broken through the edge of the universe, although I've had other deep experiences that didn't have that, they seem kind of irrelevant to the ones previously mentioned

There is no technical definition of an overdose - it's generally taken to mean any dose where the effects of the drug become unpleasant, toxic, or lethal. As an example, you can overdose on pot and heroin: heroin OD will kill you, pot OD will just make you feel like you've gone to Hell for a few hours. Both are ODs, but the nature of the drug dictates what kind of effects happen at what does.

So to answer your question: maybe.

Blessings
~ND