1. I was starting to having aniexty and panic attack.
2. I was starting to have aniexty and panic attack.
(1) is not correct. The verb "start" can be followed by "to"-infinitive, not by "to"+V-ing. With a progressive tense, I think an infinitive is preferable to avoid the presence of two verbs in -ing, as in (2).
3. I started having anxiety and panic attacks when I was young.
You can see the difference in meaning between (2) and (3), can't you?
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