Weakness in ALS is due to muscle wasting and abnormal input from the spinal cord to the muscles, NOT joint
abrnormalities (you mentioned that the knees were weak
). The mouth symptoms are also not typical of bulbar ALS, as this is usually quite serious and is manifested as difficulty swallowing (actually choking on foods), slurred speech, and facial and eye muscle weakness. Finally, the little shaking you have may be a bit of a postural tremor, a common finding in normal patients.