Your brain and neck scans came out clear. I'm assuming it was a MRI. .

the symptoms you mention-
numbness/weakness on arms and face
(forgot to mention this was also happening on right hand side)
neck/head pain - irritated, nauseous, get shooting pains, sensitive scalp
Xray showed the reversed curve in {c spine?}

[My last two visits to physio and massage therapist involved a lot os rubbing and work around this round bone and each time I have come home and woke up in the middle of the night with nausea and began vomitting (this is what has happened tonight). AM I doing wrong by having this treatment / why is this happening.]

Possible could be from toxins that are released due to the massages.
ask them about that.
You should have been advised to drink lots of water after.
You might ask them about trigger points - that could be a part of the problem also.

Do you do a lot of desk work/typing/ or repetitive arm use?

I'll give you a link to our thoracic outlet forum {TOS} useful sticky thread and you can read and compare symptoms to see if more fit for you -
the first post has links sorted by category -
http://neurotalk.psychcentral.com/thread84.html