Hi Tinky, unfortunately it seems HRT can cause some side effects/exacerbate symptoms and you can't really find out if they're going to go away without persevering with the stuff for a while - usual recommendation is three months after which time if there's no improvement, it's worth trying a change of HRT type.
I wonder when you are putting on the oestrogel, as I found that applying it just before bed really wired me and interfered with my sleep. Switched to putting it on in the morning and that helped. The other side effects you mention, I had all of them except the low mood and the restless legs with various HRTs, and after a few months they all diminished and went away - different HRTs gave me different side effects, not necessarily all at the same time.
If you can put up with it, try and see it out a while longer and see how it goes. Otherwise it might be worth seeing the GP to change the HRT type.
LL xx