There are a lot of women who feel HRT isn't for them but usually it's because they have not been treated correctly (usually by a GP who knows very little.) Yes, some GPs are good but the majority are not HRT trained.
When they are asked what they have tried with HRT it's usually a very short list.
There are lots and lots of different types , doses, etc.
Most women who say it doesn't work for them have only tried a couple of types and not all the doses available.
For low mood, you can try St John's Wort although it can't be mixed with some other drugs.
The charity MIND has a lot of advice on low mood on their website. It's been proven that exercise is as effective as ADs for mild to moderate low mood. Also it's worth looking at CBT as Janiie said.
You said you stuck with HRT previously for 5 months. But did you increase the estrogen? Did you try different types of progesterone with it?
The extreme low moods - and I reallly do mean extreme - coincided with when I took the pills. But I don't think one is allowed the gel without the pills.
That would be micronised progesterone - low mood can be a side effect.
You have many different options, including the Mirena coil, Norethisterone (which is probably what's in your new patches) or Femoston tablet form.
There is also the option of longer cycles (every 2 to 3 months) with medical supervision where progesterone is used for 12 days per 2 months or even 3 months.
Ask your GP to refer you to a menopause specialist?