I've been on 25mg of Zoloft for 12 days now and for the most part I feel like my side effects have gone. But this past week I've noticed I'm back to feeling irritation, and that butterfly feeling in the chest. It's only happened 2 out of the last four days and they were not in a row. Now today I woke up shakey and jittery. Felt like this and queezy on and off all day. Just curious if this is something the medication is doing or is something else going on. Tonight I started feeling a bit off balance, light headed and weak. Often what I've complained about numerous times in my past and drs Always say it's down to anxiety... but now I'm on medication why is this still happening. (Even tho it's no where near what it used to be like). Is it common to have good days and odd physically bad ones?? I'm feeling so stressed over feeling sick today. Any info would be greatly appreciated. Thank you