Should I stay or should I try something new?

Should I stay or should I try something new?

I have been working at my same employer for the past 8 years and have worked my way up from entry level to department manager and have acquired a wealth of industry knowledge and a great reputation. Yay! I just got my last promotion to manager in June when our department manager (also VP) retired. I inherited about half of her duties, while a coworker (remote worker with a PhD and an additional 5 years in the business) got the other half of her duties... and I'm supposed to report to her.

I like this woman I am supposed to report to and I've worked with her for a long time, but I don't actually do much reporting to her, just the occasional conversation, and she rarely works during our typical work hours. The team has been expressing confusion as to what she's actually doing, which is not great for morale, but I support her and say "she has other duties that are not your concern". Other than covering for team members while we are sick or on vacation, I think she does very little, but she keeps referring "other tasks" she's been given, but it's all so cryptic. I know what her official job description is and I just can't figure out what she's doing, but she's my boss so I guess that's not my business? And I'm also concerned that she's going to leave the company soon because she just moved across the country and she could probably find a way better job out there, especially with her qualifications.

My team is short both an inside (former was fired in Dec 2019) and outside sales person (former was fired last month) [both firings were completely justified FYI] right now, and two other women on my team will be retiring next year, one in February and one in July, which just leaves myself and one other existing team member left. With time narrowing and me being left in the dark about recruitment from the company owners (which is not my responsibility, nor do I have the tools to recruit), I'm expected to be able to train a new outside sales person, two new inside sales people, and a new customer service person for my team all within the next 6-9 months (before half my team retires), and we haven't even interviewed anyone yet. And of course this is on top of doing all the other things my job requires, which is a lot. I'm worried my whole department is going to fall apart and our business will suffer and that it will look poorly on me as a first time manager. It's really got me anxious and wanting to jump ship, despite the fact that I love my job and I love this company.

My husband says I should look for a new job... he knows all my complaints and he thinks I'm being taken advantage of. I know my former boss was often taken advantage of, and she was a VP with 45 years of industry experience. I'm scared to leave because I've been here so long and it's comfortable, but I think my husband might be right. Maybe it's time to look elsewhere? I'm just scared to try something different. I don't know what to do. If I stick around, I'll get to build my own team, as long as they don't try eliminate my department or something like that... I've had that worry in the back of my mind for a while and it's still a concern. What should I do?