I would go to the meeting and clarify what benefits and for how long.
It could be just a formality separation meeting..
You could call and find out if it is necessary for you to attend this meeting.
And/Or request the packet of information be mailed to you.
Especially if travel to that meeting is an added pain inducer.. you can mention that reason in the call.

Or contact the HR dept preferably by email, letter, or call but ask for written documentation after the call, so all replies & information is documented & in writing..

Basically get anything they tell you in writing, often promises will be made or mentioned verbally, but it is easy for them to forget about.

Basically it is their choice to let you go, unless you had a employment contract.
It is their choice to make accommodations or not.

Don't make any fast decisions if they offer you something extra.
Get the offer in writing and ask for some time to consider it.. hopefully they won't pressure you to accept right now or it is off the table....