Hi, thanks for posting your concern in the HCM.
It is very difficult to comment about any disease based on these symptoms not even knowing your age, gender, Whether you have any chronic medical illness or not, your bladder, bowel habits, history of addiction, history of any past medical illness, list of any current medication etc.
However, hot flashes and pins and needle sensation in lower extremity may appear due to numerous reason including endocrine abnormality, neuropathy,
anxiety disorder etc.
You should also consult your family physician at the earliest for further clinical examination.
Hope you are satisfied with my answer. If you have any further query related to this, please write back.
In case you have any new query in future, you can directly ask me questions @ http://www.HealthcareMagic.com/doctors/dr-kaushik-sarkar/68460. I will try my level best to help you.