Tennis elbow?

I seem to have developed tennis elbow
This is a self-diagnosis but all the symptoms fit perfectly - it looks like a classic case. It's really limiting me at the moment and I'm finding it quite depressing. I think it's mainly gardening-related, though I'm sure smartphone / tablet use is not helping. Anyone in the same boat? Any tips?

'If you have a garden and a library, you have everything you need.'
- Cicero
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Posts
https://www.physique.co.uk/Supports-Braces/Elbow-Supports/Mueller-Tennis-Elbow-Strap?gclid=EAIaIQobChMI8Mmr8-md6wIVCbDtCh3d5wl5EAQYASABEgJFFfD_BwE#fo_c=2689&fo_k=26e8bf894a92bcb1c9fd303fd311ac00&fo_s=gplauk&fo_oid=9737
Mercifully, it seems to have gone away now.
Shop around. I never paid as much as this.
there are some with hard bits and fold over straps and all sorts of nonsense. That simple velcro strap worked for me. I used to just wear it all the time: it was part of getting dressed. Prevention being better than cure.
Visions of the things to be
The pains that are withheld for me
I realize and I can see
It's interesting - everything I looked up about it suggested rest, painkillers / anti-inflammatories, injections and then surgery, but nothing about these supports. And yet three out of three responses on here say supports.
Visions of the things to be
The pains that are withheld for me
I realize and I can see