Thanks for the extra information - sounds like you have had a difficult time with your contraception - I am sure that you can get a method that suits you.
Given what you have said about your headaches - the key thing that you need to find out is what was in the information from the neurologist that made your GP want to switch you from combined hormonal contraception.
The thing that you need to check is - was there anything that they found in the investigations that could suggest an increased risk of blood clots (thrombosis in a vein? The pill increases your risk of thrombosis and so do migraines with aura - that is why they are not a good combination. But anything else that increases your risk of blood clots is also going to be a problem as blood clots in a vein can have serious consequences.
It sounds like they may have been worried about raised intracranial pressure - in this case I think you would need to contact the neurologist that did the investigations - your GP could write to them and check whether the neurologist feels you are at an increased risk of blood clots. If yes then it would NOT be a good idea to go back on the combined pill. If no then you should talk with your GP about why they thought it was a bad idea.
If you can’t go on combined hormonal contraception then we should think through your other options. Zelleta is the same as Cerazette.
One thing that might be worth considering is going to see a specialist in contraception. Most big hospitals will have a consultant in sexual and reproductive health care that specialises in contraception. It might just help to talk through all your options with them.
Also worth checking out the information on the SH:24 website so that you know that you have considered all of your options - things like ‘natural cycles’ or the diaphragm may be an option for you - check out all the methods here https://sh24.org.uk/contraception
It would be really helpful to everyone on the forum to hear how you get on so do please keep us posted and let me know if there is any further information that you need.