Why am I constantly dehydrated

Mai

Hi everyone, I was just wondering if anyone else experienced this? I drink plenty of water, but am seemingly always dehydrated! My skin on my face is dry in patches and my lips are crippled! This was never something that happened before I was pregnant but is becoming a massive problem now! I know I’m retaining water as well because of my constipation (TMI) and generally being well in time with my body. But I can’t figure out why this persistent dehydration is a problem!!! My doctor just says to drink at least 1.5-2L of water a day! But I’m so uncomfortable!!! My mouth and throat are also disgusting feeling and I have a headache, it’s like having a hangover with no justification for it! Any help/advice PLEASE