I would suggest that you on no account draw the attention of the IRS to your situation by asking them anything.
An hour with any reasonable accountant should set your mind at rest.
Residence and domicile are quite differnt in England which makes a unique distinction between the two conditions. In either event, it is for the UK Revenue to decide which might apply in your case.
I think that jetupset is correct in as much as; if your work originates in the UK and you are paid in that country; you will then be liable for UK tax on those earnings.
However, if you are taken as being resident for tax purposes outside the UK, then the Revenue may agree a proportion of your earnings which were derived from employment outside the UK which may fall free of UK tax.
It is a nightmarish field of operation and I would really recommend that you take some expert advice.
Be warned: Once you have drawn the attention of the IR to your affairs, however innocent you may be, it is well nigh impossible to ge rid of them.
They have this funny Gallic idea that you are guilty until you prove yourself innocent- and that can take a lot of bucks in accountancy fees to do!