Hello from JustAnswer.
There are two key possibilities. It certainly is true that these could be withdrawal symptoms, and if the symptoms started within a day or two of stopping the supplements, it is more likely that these are withdrawal symptoms. In this situation, the symptoms typically go away spontaneously, and usually within a few weeks.
The other possibility is that there is some underlying condition that these supplements has been treating, and by stopping the supplements, the underlying condition is now starting to cause symptoms. You do not say what was the reason that you first started taking all of these supplements, but whatever original reason was present could also be the underlying condition that could now be causing these symptoms. In the situation in which there is an underlying condition, the symptoms would typically not resolve spontaneously in a short period of time, and there may need to be further treatment of the underlying condition. If you stopped the supplements because you simply wanted to stop them, treatment of the underlying condition could be done by resuming the supplements. However, if you stopped the supplements because of side effects, then it would also be an option to discuss prescription medicines with your doctor.
So, it is reasonable to first see if the symptoms resolve spontaneously over the next few weeks. During that time, it would be fine to use over the counter medicines to help ease the symptoms, such as using anti-inflammatory pain medicines for the headaches and inflammation, diphenhydramine for sleep, and laxatives for the constipation. And it sounds like you are already doing the last two interventions, as the diphenhydramine is the usual drug in over the counter sleep medicines.
If I can provide any additional information, please let me know.