side effect to Zoladex

Hi, I’m new here! The doctors found endo after a 10 year long search for answers. I had a huge amount removed 9 months ago but still have pain in the bottom left abdomen. I am getting Zoladex injections and I’m half way through. Since my first injection 4 weeks ago I have experienced very low moods. I’ve never been affected this way and I am scared and feel like I’m all over the place. Unmotivated, can’t concentrate, thinking the worst about everything. I have made a doctors appointment to check my hormone levels but has anyone else felt the same side effect. Google says it’s a common one and the sheet on side effects but my gynaecologist says it’s rare. Any insight would be appreciated I don’t know anyone with endometriosis. Thanks