Anyone felt a different brand of tablet makes a difference?

Treatment and medication
1

Ive been on citalopram for a few years and about 10 days ago I went and got some more. they were a brand that ive not had before and I’m feeling awful, has anyone had this before? thanks in advance xxx

2

Always stick to the same brand, drs think their is no difference, but its like changing meds.
Xx

3

thanks, thats exactly how it feels xxx