Twitching can be due to anxiety or benign fasciculation. Shoulder blader pain can be due to myofascial trigger points or pinched nerves in the neck which may cause twitching also.
Please do not Google search your symptoms which can cause unnecessary anxiety leading to a diagnosis like multiple sclerosis or ALS.
Please read this authentic article and under the heading:
Fasciculations in healthy subjects
Fasciculations can also be found in individuals with no neurological disease. Reed and Kurland warned that the presence of fasciculations was not necessarily a prelude to the onset of progressive and lethal disease, due to the involvement of the lower motor neuron (ALS).
These authors, in agreement with others, concluded that physical exercise, stress, fatigue, and caffeine abuse can precipitate or aggravate this picture.
Muscle fasciculation or muscle twitching is caused by minor muscle contractions in one particular area or the persistent and uncontrolled twitching of a muscle group in the distribution of a single nerve fiber or filament. Usually, they are benign and resolve on their own, but persistent flutter may need following investigations;
1) electromyography (EMG)
2) nerve conduction velocity (NCV)
3) blood electrolytes like calcium, magnesium, potassium, sodium, etc
4) thyroid and parathyroid function tests
5) blood chemistry and complete metabolic profile
The common causes can be;
1) Idiopathic; no cause is ascertained and the majority falls in this group.
2) Increased caffeine intake
3) Increased alcohol intake
5) Deficiency in diet and nutrients/minerals
6) Some neurological diseases; uncommon
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