I feel overwhelmed and isolated in my new role?

I recently took a new role in my current company for a 6-month duration. It is a new role where I am a Co-Ordinator for my department (second manager to my co-workers). So far, it has been very isolating and makes me sad deep down inside. My co-workers treat me differently now compared to before where we could always have a laugh. I am the only one in my department in a management role besides my own manager. Even then, she will be doing another role next year to fill in temporarily and I will be by myself. My manager has taught me the basics, but I am trying to learn everything by myself as when I ask for her to teach me something she often forgets, and I do worry I am a nuisance. I have been very overwhelmed recently, and mostly sad. It is a short duration and thought it is great experience to have since I have recently graduated from university. The experience can be applied to different roles. In most of my breaks I call my boyfriend for some reassurance and company or text him. He makes sure to text me often which is endearing. I have a lot to learn in this role (it is an understatement of a lot), I feel very deeply isolated. I am not sure if I am mentally doing it to myself or not.

I feel overwhelmed and isolated in my new role?
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