if you're husband claims you assaulted him they have to look into it, unfortunately they can't take your complaint on until they have dealt with this one, so the day the case is closed make them pursue the complaint you made, they call it "counter-complainting."
i have been dealt from the same pack of cards and are now complaining to high hell with them as this dates back to 2008, they even took property off me and was released on court bail the following day pending trial, which was set for 3 and 1/2 months later only for the day the before it went to court the case was dropped as evidence pointed towards the person who pointed the finger at me (if only they'd got the evidence before acting), the person who pointed the finger got away lightly as 2 people can't be charged on trial for the same crime (unless they did it together) and yet this person works in a school, cps are slow at the best of time, just let your solicitor deal with it as if he has sent them messages he will be caught out. also find out if he is allowed to have any contact with you??
as for the medical attention you requested in custody put in a formal complaint to "professional standards department" as this is against their "duty of care" they have towards you, don't let them fob you off its took me 2 and a bit years to get them to admit they left me without food & drink for almost 20 hours and are still pursuing a reason. you can complain about the cops at anytime but maybe not your husband until the case has been dealt with.