Hi @Christabel03
Many different and weird side effects are reported for tamoxifen ( and the AIS like Letrazole) and mood swings is one of them.
When I started taking Letrazole I read somewhere that it could lead to hot flushes but taking it at night mimimized that so that’s what I did and I didn’t get much in the way of hot flushes - it may be that taking it at a different time of day can help or that things settle down after a while.
But definately talk to your oncologist , it’s important to address side effects to try and keep up these drugs.
Hopefully others on here taking tamoxifen can hop on here and let you know their experiences.
Take care🌺