Services vary widely in different areas, as do GPs and their attitudes/helpfulness.
Some possible options to consider:
see a different GP who may (or may not) be more helpful
Ask to be referred to see a Psychiatrist (for a one off appointment) to discuss medication options and/or other strategies. He/she will obviously be more knowledgable than the GP re ADs during pregnancy.
For example where I work we have a Crisis Team who see people generally for a few sessions and we can then refer on to other services (such as for CBT) if this is needed at a later stage.
You should be able to self-refer to a Crisis Team but policies vary in different areas.
There may be a specialist peri-natal service that sees women during and after pregnancy.
Sorry that this may not be of use to you if none or few of these services exist in your area.
It sounds like as well as the possible signs of depression you are feeling very frustrated and angry towards dh. Talking to someone about all of this (such as someone in a Crisis Team) may help to unravel the priorities i.e. what you would like to change first and practical ways to address these issues.
Obviously I don't know you or your history and it's difficult to offer support in a few lines without making it sound like "Oh Turtle just to x, y, and z and it will all be ok" as it is not as simple as this. Also it's hard for you to convey in a few lines how you feel exactly.