Welcome to the site.
No, freon leak would not cause such nerve problems and it does not usually lead to serious long terms health problems. So relax it is not a chemical cause leading to your symptoms.
It appears from your symptoms that you perhaps re suffering from what is clinically termed as Cervical Radiculopathy which is colloquially and broadly described as irritation of nerve in the cervical region ( neck) which thereby leads to symptoms like tingling , numbness of limbs, feeling of pins and needles in the limbs, dizziness, headache, imbalance, etc
The cause of this condition could be nerve compression , also called as pinched nerve in the cervical region, so i will suggest that you get a Cervical MRI or CT scan done and seek physiotherapy from a physiotherapist and vitamin b12, folate , pregabalin supplements from your physician all of which work on such condition and help to alleviate symptoms as mentioned above.
Kindly see the link below to know more about Cervical Radiculopathy.
I hope this helps.
Wish you all the best.
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