In the meantime let the embodied Jiva solve its present problem and find who he is. Then there will be an end to such doubts. The real Self is continuous and unaffected. The reincarnating ego belongs to the lower plane, namely, thought. It is transcended by Self-realisation.
Reincarnations are due to a spurious offshoot.
Therefore they are denied by the Buddhists. That is as true as the present existence. Find out who is born and who now has the trouble of existence. So find out from where the present problem arises and in that place you will find the solution. You will discover that there is no birth, no present trouble or unhappiness.