ALS or toxic neuropathy

Hello.21 years old diagnosed with ALL(acute lymphoblasic leukemia) 2 years ago.Used to have chemotherapy(vincristine,methotrexate,asparaginase) and dexamethasone.Now I'm receiving it too.Couple months ago strange symphtoms appeared.Muscle fatigue,weakness,vertigo,pins and needles and numbness in fingers and in hands,pain in muscles.Also there were fasciculations and one or two cramps,trouble swallowing.I did EMG which found increasing capacity of motor unts and their range.Also there were fasciculations in some areas.But no fibrilations and positive sharp waves.Doctor said that this can be caused by toxic effects of drugs(polyneuropathy) and she did not see any motor neuron troubles and it's not clearly anALS.
Can it be so?I read that on the first stage of ALS can be seen a decrease of capacity motor units with fasciculations and fibrilations and then capacity starts to increase and psw,fb and fa begin to appear.Should i worry about possibility of als or not?Thanks for the answer

[Londres70]

I will totally agree with your physician; this is NOT ALS.  All of this is related to the chemo.  As an Oncology RN, I would see these problems quite often.  

[Keithx]

thanks.It really helps