Recently , all my teeth ve become v.sensitivite[while drinking non cold], went 2 dentist, all fine, any other causes/health issues which may cause this?

MInor issues?: I have found that when patients are under stress, they often clench or grind their teeth which may cause them to be temporarily more sensitive than normal. Your dentist may have told you everything was "fine" & essentially be correct. Large metal fillings, exposed root surfaces, marginal breakdown of fillings are other possible causes & while may not require treatment, can cause sensitivity.

Clenching: Clenching or grinding your teeth can cause sensitivity. Tooth grinding and fatigue are two signs of sleep apnea which affects at some point 1 in 11 women.

Toothbrush Abrasion: I agree with the previous answer as a possible source, there is yet another, it is called toothbrush abrasion. This is when someone brushes too hard, usually in a straight line, over time, it will cause recession and sensitivity. If you brush hard, please stop. Take it easy and spend more time gently brushing your teeth. Try "tickling them to death" instead of "scrubbing" them clean.