Welcome!
If you have a diagnosis of Asperger's, (or any of the other earlier categories) you do NOT need to get reassessed. Your diagnosis stands. It is simply now documented with current specialists as "Autism Spectrum Disorder." You already have a diagnosis, save your pennies.
If you're in USA, find a local chapter of The Arc. Ask if they have an "Autism NOW Center." They help support adults as well as kids on the plectrum, and this means help with independent living, job skills training, social skills classes, support staff to help you in the community running errands or going to appointments, etc.
Best success to you, and again, welcome to AC!