Hi,
To second sarahkelly's post^, sorry you're still in pain. Sounds likely that there is some neural (nerve) aspect to your problem as you're getting tingling and pain radiating in that particular distribution. Would definitely suggest letting the physio know - sometimes treatments we do can cause an increase in pain post-treatment but generally I warn patients when this will be the case and will tend to progress slow and gently in this situation.
If it is the nerve that's irritated or inflamed, they usually take a lot longer to settle down and people can have problems lasting weeks or longer. It may seem to get better initially and then stay around the same, as it has done. Although it's very difficult to assess and give advice without having the whole picture. Generally, I would say perhaps there is an underlying problem i.e. postural, as sarahkelly touched on, that may be causing the symptoms to persist.
Were you given any exercises or advice? Are you taking any pain relief? Have you tried using a wheat bag/hot water bottle around your neck as you've said hot baths do tend to ease the pain? When is your next physio appt? I would suggest ringing to see if you can get an earlier appointment or some advice from your physio if your pain levels are still very high and do not settle.