Goodness @thelmat you are actually doing so well generally, but yes, it all takes it out of us doesnt it. 
Be aware Hormone Blockers can make some ladies mental health suffer due to the effects of the drugs themselves. Some have found certain brands have been more problematic compared to others.
Each pharmaceutical company uses a slightly different combination of ingredients to make the actual tablets. And some of those ingredients can create nasty side effects. So initially I would check all that out first.
My Oncologist did say that Letrozole had side effects similar to chemotherapy drugs. I also heard of one lady who staggered taking the Meds for that reason.
Its worth reading other threads on here related to Letrozole etc, so you can see if there is any correlation between the drugs and how you are feeling.
With chemo I learnt to rest a lot. Im considering doing the same for Hormone Blockers if I start having problems.
The fact you have not had chemo, could mean you are more aware of the side effects. Whereas, I am hoping, having gone through chemo and survived, I may find Im more able to tolerate side effects. At the moment I chose to have a slight break from meds until I completed radiotherapy. I needed my body to recover a bit more before piling a load of other ingredients into it.
But on a general level of anxiety and low mood, I found doing: Simple meditation and breathing helped; eating well; giving myself lots of TLC; resting often; doing simple Arts/Crafts; watching good Movies/programmes; chatting to friends; coming on this Forum; accessing BCNow, Someone Like Me Volunteer; chatting to Nurses on this Website; chatting to MacMillan Nurses and Wellbeing Volunteers; accessing courses for Understanding cancer pathways.
Other ladies have found the following to be helpful:
Acupuncture; yoga; wellbeing YouTube Videos; exercise of your choice (but done carefully); attending a local Maggies Cancer Centre; going on Online Courses via Look Good Feel Good Courses; applying for goodies boxes eg. From Little Lifts; accessing Cancer trained Counsellor.
The more of a variety of strategies we access, the better we get through the anxiety.
But remember anxiety is created for a number of reasons eg. Medical effects from drugs; worries; worrying about worries; not eating enough of the right foods; not getting enough sleep etc. So try and see if you can figure out the root causes of low mood, then you will be able to have more targetted solutions to it.
Hope this gives you a starting point.
Happy to share more if needed.
You will get through this. It just all takes time.
