Does anyone have experience with mid-life onset allegies/asthma and have you found allergists and/ or shots to be effective in controlling your symptoms?

This is the second year I have been slammed with severe allergy induced asthma issues. I thought I had made it through the gauntlet after April, May and June only to be taken down last week. I am starting to fear that this ‘shift’ is going be become a permanent problem and am considering allergy testing and consulting an immune specialist. Can anyone tell me if this has been of benefit to you?