Whenever I send an email I get really anxious afterwards and am constantly checking my emails until they reply.

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Currently it is because of an email I sent to a former teacher. I have a good relationship with this person and in last email she said to let her know how my lectures are going. Now i know logically she wouldn't say that if she didn't want to know. Also when I emailed her a couple months ago explaining how i was settling into uni, she even emailed my mum saying how pleases she was that i had emailed her. Yet despite having all this evidence that she doesn't mind me emailing, every time I do I feel like I'm being annoying and she doesn't care. And that she's got more important shit going on. Like she told me her daughter has developed a ED, she didn't have to tell me that, so surely there is some level of respect for lack of a better word in this relationship. I doubt a teacher would just tell any student something so personal about them or their family.  But its now been a day and half since i emailed and with every hour that passes i get more and more anxious and feel guilty for sending the email in the first place. Even though I know that people are busy with their lives, hell I barely have time to do much more than uni work and I don't work from 8 - 5 (and a lot of teachers probably work longer than that) but i still cant get this horrible feeling to go away.

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But it doesn't have to be an email as personal as that, in school would get anxious just when I've sent an email to a teacher asking if i have missed any work or (more recently ) asking professors to clarify something they said in a lecture. I don't know why, i just always worry that I come across as rude or something. This leads me to either wasting my whole day waiting for them to reply or just not emailing them in the first place and then not getting information that would probably help me.

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And its not even just emails, whenever i post something in a group chat if nobody replies I always think I've offended someone, and i keep checking who has read the message and coming up with reasons why the haven't replied