My mom died and I’m questioning everything

My mom died about 1.5 months ago, she was my best friend in the whole world. and the last week or so I have been overthinking everything, even overthinking my amazing relationship with my boyfriend, I find myself questioning my love even though I know I truly love him. When my mom passed she said to me "keep him in your heart" and of course this meant a huge amount to me. I feel so bad for having these thoughts but my counseller and friends all tell me that it's completely normal, has anyone experienced this before?