I know it's really hard, but force yourself NOT to obsess over your physical symptoms
is a strong drug you and your body obviously habituated to the regular daily intake of it. You stopped it and now your physiology is rebounding from that: Headaches, body aches, upset stomach, diarrhea, lack of sleep, severe anxiety, lethargy, all of it.
Hang in there, honey. All of this will be MUCH different in a week; I can almost guarantee it.