Here are some things to do when you get home.
1. Don't try to work through the numbness by riding longer. It doesn't work that way. You need to ride less, not more, until the problems are resolved. Numbness is NOT an inevitable part of riding. And when you start riding again, don't ride to the point of numbness. Take more and longer breaks.
2. If you don't have padded shorts, get a pair. If your padded shorts are more than a few years old, replace them. Compressed foam or chamois is less effective as a shock absorber.
3. If the problem began after you switched saddles, be prepared to switch back to your old saddle. Brooks saddles do not work for everybody.
4. If you have flat handlebars, add bar ends. Also consider drop bars or other handlebar designs. Having a variety of riding positions is easier on the hands.
5. Get someone with an experienced eye to check your fit. Many bike shops offer the service, or can recommend someone. The right adjustments may make a big difference. Or, you may find that your bike is not right for you and cannot be made to fit, as happened to a friend last summer.
6. As Quester says, see your doctor and describe what is going on.