Thank you for your question. Although without being able to examine you I can not offer you the specific advice on diagnosis and treatment that you need, but I would try to provide you some relevant information about your health concern.
This muscle twitching is also called as muscle fasciculation & appears when the muscle contracts on its own (without nerve stimulation). Most of the times muscle twitching occurs without any underlying disorder & they are not harmful or may appear after viral illness or vitamin/nutritional deficiency, anxiety and hormonal disturbances. But sometimes this muscle twitching appears as atrophy and weakness of muscle as well and might be associated with any neurological disorder. Most likely cause of this twitching with pain of muscles can be when the nerve supplying to arm muscles is not functioning properly due to any vitamin/nutritional deficiency. If you suffer continuous weakness and notice reduced strength of muscle bulk, please arrange an appointment with a neurologist right away who will evaluate the possibilities here. Hope this information proves helpful to you.
I agree with mikerobinson41, sounds like BFS if you are not having any other symptoms.
Online information can be a "double edge sword." It is great for getting information at your fingertips but on the other hand it can freak you out to where you think you have everything under the sun. If you want to have peace of mind you can see a Neurologist to have a thorough evaluation vs going online and reading information that is going to make you more anxious.
Lastly, YOU ARE NOT CRAZY.
Keep us posted.
hey until you see any other symptoms(99% sure they wont happen) DO NOT go online and freak yourself out, i've thought i've had everything bad in the world, those little 'twitches' are called fasiculations, i get them too, they started june 09, but i have a much worse case of symptoms, you probably have BFS.
ps. im only 19, male, and extremely active so i think your alright, and not crazy!