To be honest, you probably added to much too son.

I reckon if you add 5 miles to the total every couple of weeks and / or do some slower rides that allow your body to recover, you'd be better off.

You do have to build fitness AND allow the body to recover after effort, otherwise, you will get fatigued and / or become ill.

Keep it up, but perhaps only take smaller steps until you are comfortable at each juncture.

cheers