I recently had my second LSD trip with some MDMA (40mg, so 'minimal') and the sentiment behind yourr question prompts me to reflect on some aspect of this...
I feel permanently changed.
The experience was like droplet of water into the pond, I could still experience the ripples of the experience in my day to day life afterwards (like a month at least!). It felt as if it was seeping into the structure my daily reality. Parts are still there. Stimulants or other emotions can activate me as well.
'Am I going crazy?" Some integration(?) which occurred:
I was meeting up with a best friend about 2 months after the trip. Up until then I had really been engaging a lot with the persistent experiential effects I was experiences. It was a beautiful sunny summer day out in the park where we met. We were talking about wonderful things like art and such
I started recounting the experience as well as the raw aftereffects, and some emotional and existential parts of it. In touching upon these memories as I recounted them there with him, my awareness suddenly elevated as if tripping again. His eyes and voice were like glowing light god ness, every word he (and I said) felt like some divine rememberance. That among other things. It was profound. i felt like earth was some reality upon which there were these reality wormholes which people spoke and saw me into.
Details aside (it was very existential) I feel like a good portion of the trip-energy that had been simmering in me was processed through this experience of talking it out with someone. What I mean by 'processed' is that I touched the memories with language. A sort of balm as you will.
The native americans say conversely in a way, (and I paraphrase) 'Do not speak of what you see for at least a year to keep the energy strong' ~ however this was my second trip and I am a highly emotional person so I chose to really dive into sharing it with some wonderful friends. I can only recommend this for integration/diffusing of the energy so far from my own experience, even if the listeners have no personal experience.
I relate to you when you say "am I going crazy?" as I had some really powerful persistent existential-percentual feelings from the LSD and "am I going crazy" is something I felt myself during this time period. It was all as deeply moving as I know the fabric reality itself to be.
Looking back however, I do feel like I have done a good job reflecting on, and integrating the perceptual changes which have persisted. Many of those more existential and difficult perceptual changes seem to have subsided as well when shared with other people. I feel like this balming through sharing effect really works best in-person.
I would like to note that when talking this out with people, I recommend doing so in a setting you would feel comfortable revisiting trippy energies in, as well as asking the listener if they are okay being with you should trip energies arise.
Many other energies I have just learning to live with as time goes on, and some I do really appreciate.
(F Y I ~ I'm a highly emotional and young psychonaut, so please take my words with that in mind! I have not tripped on DMT (yet

)
I wish you all the best
Feel free to reach out if you wish to chat.
~ Best wishes friend ~