Thanks for your question on Healthcare Magic.
I can understand your concern.
Calcium,
vitamin D3 and
vitamin B12 deficiency can cause similar kind of symptoms.
Since you were on dieting for
weight loss, deficiency of these nutrients is more likely.
So better to get done serum levels of calcium, vitamin D3 and vitamin B12.
If deficiency then you will need supplements.
If all these are normal then stress and
anxiety might be causing these. You are also having
tachycardia, this also favors stress and anxiety.
So avoid stress and tension, be relax and calm.
Don't worry, you will be alright.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks