Hello and thanks for your post,

I am sorry to hear about your different symptoms and I hope that you have managed to make an appointment with your doctor. 

We can't diagnose anyone on the forum and we would always encourage someone to seek medical advice when symptoms don't appear to be going away. The lump and the headaches may not be related at all so try if you can not to overthink it for now.

Headaches and nausea and dizziness can be brought on by different reasons including stress, lack of sleep or not drinking enough fluid but it is only really your own doctor who can examine you and perhaps organise some tests that may be able to get to the bottom of the cause.

This is what the NHS has to say about headaches here

We also can't diagnose the lump which may well be a cyst (not cancerous) or an insect bite. 

Even though it is comforting hearing from other members of the forum, do remember that other people's situations may be different from yours so it is difficult to compare one person with another.

The Patient Association have produced some information about how to get the best out of your appointment which you may find helpful to look at here

I do hope that you feel better soon.

All the best,

Catherine