I am a fallout newbie so there may be a way of working this out but I thought I would ask. I fear I am getting near the end of the game, meaning I will need to start sleeping, talking to my family and working hard again. Basically, the missions are starting to dry up. Where as previously I had a Pip Boy screen full of open quests I am now limited to;

Emergent Behaviour

Road to Freedom

Semper Invicta

Jewel of the Commenweath

Misc - Report to the director of the General Atomics Galleria

I realise that some of these will open up a new thread of missions but I wondered - and I realise that you don't know what missions I have completed - who should I be talking to in order to open up new missions?

As a perfectionist / OCD character I am frightened to death I might be missing things.

... you're not even close to the end of the game. Those are all fairly early quests. Remember, this game lets you keep playing after the main quest, and there's no level cap. It's a huge game, and it's got quests that'll repeat forever and ever if you manage to exhaust all the quests that don't.

Jewel of the Commonwealth, Semper Invicta, and Road to Freedom all lead to other quests - also, you can talk to Preston Garvey and he'll give you a never ending supply of quests once you join the Minutemen... enough quests to almost burden you.

Also, it'll help just to get out and explore.

If you don't have more big missions, that means those big missions you have need to be done.

And don't strain yourself over OCD, because you will miss quests depending on your choice later on.

There is such a huge amount of quests that you will probably never run out of things to do. The game doesn't end, after 'the ending' so You can keep playing afterward. You've only scratched the surface.

If you haven't been to the Jewel of the Commonwealth (Diamond City) yet, you will find so many quest there! And like Box Maaan said, talk to Preston, and the Minutemen will keep you very busy.

Your quests are starting to dry up because you haven't -progressed- the main story, not because you're nearing the end of it. You haven't even been to Diamond City yet, which means you still have 75% of the main quests left to do. You'll pick up a bunch of new side quests there, as well as progress in the main story. You haven't met the Railroad yet, which is another source of tons of quests. You haven't really started any of the Brotherhood of Steel quests yet.

Are you serious? You're nowhere near the end of the game.