Factors that break and don't break the fast

Q: Whenever I am fasting and feel something in my mouth but I am not sure if it is actually something or nothing, can I just swallow it? 

Q:

1. Can I lick the skin outside of my lipline during fasting?

2. I was told that because spittle can unintentionally go on my lips when talking, I can lick it. Does this apply to when the spittle lands outside of my lips?

Q: I'm fasting today and I felt something come up my throat. The regurgatation felt quite full/big, however, it didn't reach my tongue. I swallowed it. Is this fine?

Q: Frequently, when going in sajdah, the fabric of my headscarf or the prayer mat ends up on my lips or in my mouth. This is an issue when I’m fasting. I don’t know if anything like microfibers or small hairs have entered my mouth. Today this happened during salah but I couldn’t feel anything in my mouth after it occurred so I assumed I could swallow as usual.

1. Was this correct?

2. If this happens during salah, and I feel something in my mouth after, do I have to spit?

3. If this happens in salah or near the end of it, do I have to check in a mirror afterwards to see if anything inside my mouth?

Q: I wasnt sure if lip balm went into my mouth during fasting so I closed my lips and licked the inside of my mouth to try and taste it. I believed I swallowed in attempt to figure this out. I only realised after that I shouldn't have swallowed - although, I didnt taste any lip balm so, is mt fast valid?

Q: The moisture left on my lips from washing my face/mouth during wudu, is this safe to be licked and ingested when fasting? Usually after I wiped my lips in wudu, I have to spit and then let my lips air dry and/or wipe with a tissue until dry. Today after wudu, the majority of my lips were dry but in the corner of my lips I felt a coolness, which may indicate that there is still moisture from wudu left. I licked that area. So now I’m just wondering if my fast is valid. 

Q: Does the inhaling of the fragrant mist/steam that is emitted by an aroma diffuser break the fast?

Q: What to do if a woman, while fasting, inserts a dry tissue in her private part. Tissue was dry but private area is wet so it might happen that while inserting tissue wetness goes in. Does she need to repeat all those fasting?

Q: What is the ruling for a fasting woman who inserts portion of the tissue into the private part for istinjaa? Will her fast break through this?

Q: When sitting down during salah, there is a build up of pressure in my vagina - I have a sensational feeling (involuntarily without thinking of sexual thoughts) is my fast invalid? I don't know if there was any emission.