Short Answer :
Yep. Totally normal for methamphetamine withdrawal.
The rule of thumb? Whatever the med did for you? Coming off of it will do the opposite for awhile. Racing thoughts >>> Sluggish thoughts. Etc. For most people, the worst goes away fairly quickly, and eventually completely over time.
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Long answer :
Amphetamines have a fairly short kick, because they have a fairly short half life. 3 days for the worst of it, then it gradually steps down over the next 30 days, 60 days, 90 days, 6mo (PAWS tends to set in here), 12mo, 18mo, 2 years.
AA chips/ coins/ keychain tags are built around Alcohol Withdrawal patterns... Each coin marks the most common end to a certain stage of withdrawal/ recovery/ suckiness. LOL They aren't just random time markers! Conveniently? Opiates & most stimulants tend to follow the same withdrawal patterns. As you pass each time marker? Look back at how different things are now.
Certain other meds & substances (benzos, ludes, etc.) have very different patterns : the first 3 days in alcohol/opiates/stimulants may be the first 4 months of a benzo kick. The half life of some of these meds is astronomical, weeks and months instead of hours.
It's going to take some time (approximately 2 years) before everything returns to absolute normal. The worst of it, though? 3 days. 30 days. 60 days. 90 days. 6mo. 12mo.
All of that ^^^ totally separate from PTSD. Generally, the more recovered you are from the addiction, the worse the PTSD symptoms are going to get without treatment. Addiction just adds a whole 'nother layer to deal with on top of PTSD... Which is a big part of why Dual Diagnosis treatment is so very different from "simple" drug&alcohol treatment, or "simple" mental health treatment. Dealing with 2 things that each spur the other on.
Have you looked into Dual-Diagnosis treatment
@sonicwhite ?