Hi Cherrycrumble
Either oestrogel or patch oestrogen ie transdermal oestrogen - are the most "natural" was to have HRT. Utrogestan is the only progesterone that is not synthetic avaliable as part of HRT on the NHS.
If your doctor tries to fob you off - these are the most important reasons - you want to have HRT (oestrogen) through the skin so that it doesn't have to go through the liver, and you do not want to have a synthetic progestogen. Also re your migraines - transdermal HRT is recommended and some synthetic progestogens also cause migraines/headaches. They can't (or shouldn't) argue with that.
Re gel or patch - it is purely a matter of preference. Gel is applied daily so you must wait for it to dry - and you have to be careful not to have close skin contact with someone for at least an hour after application - so your activities and routines need to be taken into consideration. A patch is normally changed twice a week so you can forget about it most of the time. Some women don't like the marks left afterwards but these are easily removed with baby oil. if you go for a patch - Estradot are the smallest so would choose these - and come in strengths from 25 mcg to 100 mcg.
I use a patch and have only ever done so and have been quite happy with it. Each method has their devotees, and for some women one method suits them more than the other re absorption. Both are equally effective overall - it just depends on you, your preference and possibly your skin. Gel users like to be able to adjust the dose quickly - but many of the benefits of oestrogen are long term anyway. Patches also come in different strengths.
Whatever you choose I would start low for the first 2-3 months as you are still having fairly frequent periods, and then increase if you need to and as your oestrogen levels fall.
Hope this helps and good luck
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Hurdity x