Hey bro I wish you the best of luck. I am 29 years old and started smoking at age 17, and started noticing anxiety and depersonalization around age 25 but continued to smoke, not believing that it would all of a sudden be affecting me that way. After that, I tried a few times (usually unsuccessfully) to quit, and each time I was stricken with pretty severe anxiety and some panic attacks. In doing a ton of research, and from my own experience, I have learned a ton and will share the high points with you.
What happens when a person smokes weed is that the cannabis smoke transfers cannabinoids (I believe thc is the most famous of this class of chemicals) into the brain, where our brains welcome it into our endocannabinoid receptors. You see, the human brain makes many lf its oen necessary chemicals, such as the well-known neurotransmitters dopamine, seratonin, and norephinephrine. Our brains also make their own endocannabinoids, which are fully natural to us, but the cannabinoids in the weed mimick these chemicals and bind with the receptors in our brains meant for our own chemicals. What happens after sustained use of marijuana (for some, years, and for others, weeks) is that our brains adapt to this constant excess of cannabinoids by producing less endocannabinoids. This is called deregulation and you can google it to learn more than I've put here.
So basically, now the smoker quits weed and their brain is way out of balance because it produces less of its native endocannabinoids, which I believe affects areas such as learning, memory, and mood regulation. It is very possible that other chemicals are downregulated too, and that explains the persistent anxiety, depression, panic attacks, moodiness, headaches, blurred vision and some other effects.
So this stage is very scary because it takes a while for our brains to adjust back to normal. Based on the stories I've read online and some other resources, the process of healing fully can take anywhere from 6 months up to 2 years (and sometimes longer.)
The good news is that people do recover from this state of anxiety and generally feeling wayyyy different than before. That's how I am. I used to be super witty and charming and all of that jazz, and because I was arrogant and continued to smoke in spite of my worsening mental health, I have temporarily lost most of those gifts which I was taking for granted. That's how I view it, but you also don't want to beat yourself up with regret or any negative emotiona because they will only irritate your less-than-100% condition.
Recovery can be very difficult at times but there are many things you can try. WhennI was 20, I was kind of arrogant in some ways and didn't believe in the power of things like yoga or meditation, but many people find those things to be extremely helpful. Also a good diet and exercise helps, and it sounds like you are doing that already. Just go easy on yourself and try to enjoy the journey even though it might be tough for a while. This forum is a great resource for meeting other people going through the same process and you will find a lot of cool as f*** people on here.
Also the withdrawal stage is also called Post Acute Withdrawal Syndrome and is sometimes called P.A.W.S. for short. Usually, when you quit weed you go through an acute withdrawal lasting something like 20 days (maybe you are still in acute withdrawal, in which case your recovery might be quick) but either way just focus on the positive and you can search for something like "paws recovery weed" on Google and hear the stories of many people who have gone through shitty times after quitting but go 100% back to normal. And a lot of people are much happier after fully going back to normal, having a new appreciation for the everyday things that maybe we took for granted and now are missing from our lives.
There is a light at the end of the tunnel
Stay strong and best of luck on your quit.
You can also p.m. me if you ever need to talk homie. Good luck