If they were about to offer you a promotion or another position because of other people leaving, calling a sickie wasn't the most ideal thing to do.
Can't blame you though, that notice period was unfairly short to get advice, as if they expected you to even be able to. It might have been a cookie cutter email sent to everyone.
If it was positive, in terms of promotion, then there tends to be more interaction from the manager directly. You don't need "support" for good news or a promotion.
To me anything like this triggers - ok, better start looking.
If this is the first time being given the boot, assuming redundancy/2 year termination:
a) 9/10 it's not you - it's their changes that impact the role or the people are incompatible. Eitherway it's a good way forward.
b) Confirm in writing the last day, the payment that you're expect and when that will be made plus onfirm you're free to look for work. Also you should have a statement on the reason and if it's termination (usually this is a bullet of point of "performance" that has no additional evidence or explanation).
c) It will be a shock, don't let yourself get emotional, just treat it as a separation of a business agreement. Keep it civil.
d) You will feel mopey for a couple of days - time to get the friends around for a chat. Remember that you have value, even if others don't want to see that.
e) Look at it as an opportunity to improve yourself, look for new ways to improve your value.
f) Contracting can be a great way to get yourself back into the market.
g) Don't leave it too long - say a couple days, the more this occurs the less "shock" you'll be in, before you start looking at writing your CV and start building out your LinkedIn profile etc.
h) Start building out a hit list of applications - remember you should be tailoring applications more than ever unfortunately.