A month after starting tamoxifen and I can't stop crying crying

Finished radio 23rd May and started tamoxifen that day. Two weeks later a tsunami of bleeding for ten days. Three weeks later and I’m back at work but can’t stop bursting into tears and I have teenage spotty chin. This ca is the gift that keeps on giving. Is it normal for the tamoxifen to cause such a whirlwind of emotions? Or is it just the going back to work and everyone thinking you’re back to normal? Any advice appreciated 

I started Tamoxifen on May 24 and I too cry all the time!  My oncologist has asked I give it another month and see if that levels off.  My sex drive has also suffered!