Anxiety at 15w

I'm having a lot of anxiety.  2 previous losses, and although neither pregnancy made it past 7 weeks, I'm still struggling now at 15w.  I received a lot of extra attention during my first trimester, which was helpful.  At my 12w appt, my dr said everything looked perfect and viable and that I wouldn't need to be seen again until 16w.  The wait has been hard.  I got a Doppler thinking it would help ease my fears, by I can't find the heartbeat.  I'm average build and got a sonoline b, but can't get it.  I realize I may not always hear it and I must be patient, but it's just frustrating.  I feel like this pregnancy has brought me so much more anxiety than joy, which makes me feel guilty.  I know I'm still early, but I'm not showing at all or feeling movement/flutters.  I just feel down and I don't know what to do.