I moved host and my site is losing uniques everyday! Should i move back? was 6,000 uniques now im down to 4,000
Question 1: Has the rank of your keywords changed? Question 2: Is your server slower than the old server?
Is it shared hosting? If so, do a reverse IP to see what other sites are on it (lots of spammy sites?). If not, possibly your new IP address was previously banned due to a bad site having had it before.
Follow the guielines given by Matt cutts in his blog while moving to a new host. This might help you sole the problem.
It might well be a coincidence in that a lot of people are experience drops as well as total dissapearance from the SERPS.
Switching hosts should have no effect on your SERP.. You may have lose your rankings in the SE index..
Use this tool to check that the host is in the right country. If the country has changed your rankings will suffer. http://www.digitalpoint.com/tools/website-country/?ip=www.google.com For example if a UK site is hosted in the US on a .com it won't show up well in google.co.uk